Seowolf's Guide to Media Buying: Know What a Customer Is Worth Before You Buy a Single Ad

Your ad reports say a campaign made you a fortune. A simple holdout test might say it made you a third of that.

That's what happened to a wine club in Appendix N of Seowolf's Guide to Media Buying (a composite story, like all the book's examples). For years it credited its quarterly catalogue with every order from the customers it mailed. Then it held back 10% of the list. Most of those customers bought anyway. The catalogue's true effect turned out to be about a third of what had been claimed.

The club didn't stop mailing. It moved its catalogues to less active customers, where they made a real difference. That's what media buying is: knowing where the next pound, dollar or euro actually earns something.

Would you like to know, before you spend a penny, what a customer is worth to you, what you can afford to pay for one, and which media will deliver them at that price?

Give this page ten minutes. By the end you'll know exactly what's in the book, who it's for and who it isn't for. You'll also have the one formula to work out tonight, before your next ad goes live, and a way to read the whole book at no extra cost if you're a Kindle Unlimited member.

You've Probably Tried the Usual Fixes

If you've spent your own money on advertising, some of this will sting:

• You boosted a few posts, got lots of likes, and couldn't find a single sale they'd caused.
• You trusted the platform's dashboard, which showed a healthy return, while your bank balance didn't agree.
• You signed a year-long contract with a magazine or radio station because the sales rep was persuasive and the "package price" sounded like a deal.
• You handed everything to the platform's automated campaign type because "the algorithm does the buying now".
• You changed the audience, the advert and the offer all at once, and never knew which change made the difference.
• You doubled the budget on a winning campaign and watched the cost per sale climb.

None of that was stupid. But each of those fixes skips the same first step: working out what a customer is worth, and what you can afford to pay for one, before you buy anything.

Who We Are

We're Seowolf. We build free tools for marketers, site owners and writers, and we write the Seowolf's Guides series: plain-English desk references on SEO, copywriting, keyword research, email deliverability, web hosting and more.

A Moment You Might Recognise

Picture a garden-design business owner. (She's a composite, from the book's Start Here chapter, but you may have met her in the mirror.) She wants "more leads", and she's about to sign a year-long contract with a local magazine. The rep has a media kit, a readership figure and a discount that expires on Friday.

She has no idea what a lead is worth to her. She has no way to tell which enquiries the magazine sends. If the year goes badly, she'll never know whether the magazine, the advert, the offer or the timing was to blame.

She doesn't sign. She runs a four-week test instead, with a small budget across two channels, each with its own tracking. One channel produces enquiries at a third of the other's cost. She does sign the magazine contract later, for the right issues, at a better rate, and with numbers to prove it works.

Why This Book Exists

Media buying used to mean phoning newspaper sales desks and radio stations, negotiating rate cards and posting insertion orders. Today it also means auctions that run in a fraction of a second, algorithms that choose audiences for you, and dashboards that report numbers that may or may not be true.

The old skills didn't disappear. New ones were added alongside them. Yet most advice covers only one world: either a single platform's interface, or a traditional media textbook. We wanted one book that teaches the whole craft, every kind of paid media, online and offline, with strategy first.

The Real Problem: Buying Without a Number

The first of the book's Twenty Rules of Media Buying is the one most advertisers break: know what a customer is worth before you buy a single ad.

Without a target cost per sale, you can't tell a good deal from a bad one. A "cheap" click can be ruinous and an "expensive" magazine page can be the best money you spend all year, and without that number you can't tell which is which.

As Chapter 1 puts it, media buying is "less about clever adverts and more about smart shopping for attention." Two shops can run similar adverts on the same budget, and the one that knows its numbers ends the year with twice the customers.

The Breakthrough: Seven Decisions, in Order

Every campaign in the book, from a single search ad to a multi-channel quarter, runs through the same framework:

1. Value. What is a customer worth, and what can we afford to pay?
2. Objective. What business result must this campaign produce?
3. Audience. Whom must we reach, and how many?
4. Channel roles. Which media create, capture, convert and keep demand?
5. Offer and creative. Why should people act, and what will they see and hear?
6. Test and measure. How will we learn, and how will we know?
7. Scale or stop. When do we spend more, change course or stop?

Most advertisers start at step 4 or 5. They pick a channel or make an advert, then hope it works. The book starts at step 1, every time.

Try This Tonight: Your Break-Even ROAS

Here's the formula from Chapter 3 that the book says every strategic decision rests on:

If your contribution margin (what's left of a sale after the product, delivery and payment costs) is 50%, your break-even return on ad spend is 1 ÷ 0.5 = 2.0. Every £1 of advertising must bring in £2 of revenue just to break even. If your margin is 20%, the break-even figure is 5.0.

Now look at the return your ad platform is reporting. If it's below your break-even figure, every sale is costing you money. If you've never worked this number out, you've just found out why the dashboard and the bank balance disagree.

Chapter 3 gives you the other two numbers, contribution per customer and allowable cost, worked through on a calculator.

Why Nobody Told You This

It isn't a conspiracy, but nobody in the chain is paid to tell you.

Platforms measure their own performance, and they tend to take credit generously. One of the book's rules puts it in five words: platforms mark their own homework. Sales reps sell from a rate card, and the book's ninth rule reminds you that the rate card is the opening offer, because almost every published price in traditional media is negotiable. Many agencies are paid as a percentage of what you spend.

None of them is a villain, but none of them is paid to ask what a customer is worth to you. That job is yours.

The Whole Craft in One Book

Built around that framework, the book covers every kind of paid media:

• Digital: search, social, display, native and programmatic, online video and connected TV, streaming audio and podcasts, retail media, affiliates, creators and newsletters, and retargeting
• Traditional and offline: newspapers, magazines, radio, television, out-of-home, direct mail and inserts, space ads, classifieds, trade press, directories and events, plus remnant space, per-inquiry deals and barter
• Specialist: app advertising, push, pop, pay-per-call and lead marketplaces, sponsorship, product placement, gaming and experiential, and regulated categories

That's 46 chapters in eight parts, a bonus chapter, twenty step-by-step playbooks and 15 appendices.

Twelve Short Lessons

Appendix N tells twelve short stories (composites, with details changed), each ending with the lesson and the chapters to read. A few of them:

• The billboard with too many words. Eight products, prices, a phone number, a web address and opening hours, and nobody remembered it. The next one said "Half price sofas. Next left." At 40 miles an hour, less is more. (Ch. 18, 22)
• The radio campaign that was too polite. Two spots a day for a month brought no calls. The same budget, concentrated into eight spots a day for two weeks, brought calls from the third day. Radio works on frequency. (Ch. 16)
• The search campaign that paid for job hunters. A care-home group's ads were clicked by people looking for care jobs. Negative keywords and a separate recruitment campaign halved enquiry costs. (Ch. 6)
• The missed spots. A retailer paid for 120 radio spots, and the transmission log showed 104 had aired. Checking the log won 16 make-good spots and a credit. (Ch. 28)
• The brand that stopped TV. Attribution reports didn't credit television, so it was paused. Over the next six months, branded searches and retail sales drifted down. A geo test brought it back. (Ch. 2, 26)

Appendix L then follows one fictional business, a garden-room installer, through a full quarter, from a brief to a final report, using methods from every part of the book.

The Benefits You Didn't Expect

Knowing your numbers doesn't just make your ads cheaper. It quietly fixes things you might not have connected to media buying:

• You stop paying partners for customers they didn't create, like the coupon site that "drove" a fifth of an online shop's sales, mostly from shoppers already at checkout (Ch. 12).
• You can say no to a sales rep with confidence, because you know your maximum cost per lead before the call (Ch. 3, 28).
• Offline media becomes measurable. A unique phone number, web address, code or offer turns guessing into knowing (Ch. 23).
• You become the advertiser who's ready, with artwork in every common size when a magazine calls with unsold pages at a deep discount (Ch. 21).
• Your reports start getting read, because they answer the question the business is asking (Ch. 27).
• You stay on the right side of the law, because disclosures, consent and honest claims are not optional (Ch. 31).

The Big Lie: "If the Platform Says It Worked, It Worked"

Chapter 1 lists it among the most common myths in media buying, alongside "the algorithm does the buying now", "you need a big budget" and "cheaper is better".

Platforms report on their own performance. Some of the people who clicked an ad would have bought anyway. That's why the book separates attribution (who gets the credit) from incrementality (what actually changed because you advertised), and shows you how to measure the second with holdouts, geo tests and your own sales data (Ch. 24–26).

Automation is the same story. Algorithms run auctions and find audiences, but someone still chooses the goal, the budget, the inputs, the creative and the measurement. As the book puts it, if you feed an algorithm the wrong goal, it will efficiently achieve the wrong thing.

The Common Enemy: Buying by Feel

The enemy isn't the platforms, the reps or the agencies. It's the habit of buying media by feel: spending because a channel is popular, a rep is persuasive or a dashboard looks green.

Buying by feel is why budgets leak into placements nobody sees and why good channels get cancelled after two weeks. It's also why advertisers scale a winner until it stops winning. The book's answer is a method: value first, one change at a time, independent measurement, and a written test log.

Introducing Seowolf's Guide to Media Buying

Seowolf's Guide to Media Buying: Strategy, Maths and Testing for Every Medium teaches the whole craft, from your first ad to multi-channel campaigns, across every kind of paid media.

It's vendor-neutral by design. It names no advertising platforms, networks, publishers, broadcasters or agencies, because platforms rise, merge, rename themselves and change their rules every year, while the principles of buying attention don't. Where a feature matters, it's described in general terms so you can recognise it on whatever platform you use.

What Buying by Feel Is Already Costing You

You won't find these costs on an invoice:

• Clicks from people who were never going to buy
• Spots and placements you paid for that never ran
• Commission paid on sales that would have happened anyway
• Good channels cancelled too early, like the monthly magazine whose coded orders kept arriving for three months after it was dropped
• Winning campaigns scaled past the point where the last pound buys the dearest customer
• Fraudulent and unviewable impressions, bought because they were cheap

Easier Than You Think

You don't need a background in statistics or technology.

• Start Here walks you through your first profitable test in twelve steps, over about six weeks including the test itself.
• Every formula is explained in words, then worked through with numbers you can check on a calculator.
• Every chapter has the same shape: a level tag, a plain-English summary, a real-world picture, a Seowolf strategy note, worked examples, a case study, common mistakes, key takeaways, FAQs and exercises.
• Every channel is explained from the beginning, so you can read only the chapters for the media you plan to use.
• Experienced buyers can start with Part VII, the strategist's toolkit, and keep the formulas and channel cards open on their desk.

What You'll Discover Inside

Foundations and the maths

• The three numbers to calculate before any campaign: contribution per customer, allowable cost and break-even ROAS (Ch. 3)
• CPC, CPM, CPA and ROAS in plain English, with worked examples (Ch. 3)
• The media map: every place you can buy attention, and what each is good for (Ch. 2)
• Reach versus frequency, and how to decide which one your campaign needs (Ch. 3)
• How big a test budget should be, and why 20–30 results per channel is a practical minimum (Ch. 5)

Buying digital media

• Search advertising: showing up when people are looking, and excluding the people you don't want (Ch. 6)
• Social advertising: interrupting with permission, and why the easiest lead form can produce the worst leads (Ch. 7)
• Programmatic display bought safely, without paying for fraud (Ch. 8, 30)
• Connected TV, streaming audio and podcasts, and why discount codes undercount audio (Ch. 9–10)
• Retail media, affiliates, creators and newsletters (Ch. 11–12)
• Retargeting as a conversation, not a chase (Ch. 13)

Buying traditional media

• Newspapers, magazines, radio and television, including direct-response TV (Ch. 14–17)
• Out-of-home: billboards, transit and digital screens (Ch. 18)
• Direct mail, door drops and inserts, and why every mailing needs a holdout (Ch. 19)
• Remnant space, per-inquiry deals and barter (Ch. 21)

Measuring, negotiating and scaling

• Creative that fits the medium: a radio advert is heard, not read (Ch. 22)
• Tracking and attribution, and the limits of both (Ch. 24)
• Testing without fooling yourself: why 12 leads against 9 is not a proven difference (Ch. 25)
• Media mix modelling and incrementality, explained without the jargon (Ch. 26)
• Negotiation, rate cards, contracts and make-goods (Ch. 28)
• Scaling without wasting money: grow 20–30% at a time and watch the margin, not the average (Ch. 29)
• Advertising law, privacy and ethics (Ch. 31)
• Media buying by business type, and what's coming next (Ch. 33–34)

The strategist's toolkit

• Twenty step-by-step playbooks, from your first search campaign and first newspaper advert to a geo-lift test, a negotiation and choosing an agency (Ch. 35)
• Campaign strategy, from business goal to media plan (Ch. 36)
• The mathematics of direct response, including ROI, break-even and lifetime value in detail (Ch. 37)
• Testing strategy: building a learning machine (Ch. 38)
• Metrics that matter, and what to aim for (Ch. 39)
• Bonus: starting your own media buying service, with positioning, packages, pricing, contracts, winning and onboarding clients, and a 30/60/90-day launch plan

Start Reading Now

Proof You Can Check for Yourself

This is a new book, so we won't show you a wall of reviews we don't have, and we won't invent any. A book that tells you to use independent measurement shouldn't ask you to take its own claims on trust.

Here's proof you can check instead:

• Read the free sample on Amazon and judge the writing yourself.
• Check the table of contents. Every topic on this page is a real chapter.
• Work out your break-even ROAS using the formula above. If that one number changes how you see your ad reports, the rest of the book works the same way.
• Readers are already finding it. In November 2026, its first month on sale, it ranked #233 in Direct Marketing, #425 in Web Marketing and #445 in Advertising in Amazon's Books store.
• Try it through Kindle Unlimited if you're a member, at no extra cost.
• Check the dates. Fast-changing details such as privacy rules and platform minimums are marked "checked October 2026" and logged, with their status, in Appendix G.

If you read it and it helps, an honest review helps other readers find it.

Everything Included

• The Twenty Rules of Media Buying, the whole book on two pages
• Start Here: your first profitable test in 12 steps
• 46 chapters in eight parts, covering every kind of paid media
• Twenty step-by-step playbooks
• A bonus chapter on starting your own media buying service
• Appendix A: your first 90 days
• Appendices B–E: checklists, a plain-English glossary, a media maths reference and a troubleshooting guide
• Appendices F–I: extended case studies, the verification log, FAQs and templates
• Appendix J: a quick-reference card for every channel
• Appendices K–M: where to find things, a complete campaign from brief to report, and the media buyer's annual planning calendar
• Appendix N: twelve real-world stories, each a short lesson
• Appendix O: test yourself with 120 questions and answers
• Index D: Seowolf's free SEO and marketing tools, mapped to media buying tasks, plus a full index

What It's Worth, Honestly

We won't put made-up dollar values on chapters. Instead, compare it with what you're probably weighing it against:

• One bad media contract can cost more than a shelf of books. The book shows you what to check before you sign, and what to claim back afterwards.
• An agency or consultant usually charges more for an hour than this book costs. If you hire one, this book helps you brief them and question their reports.
• A month of ads bought below break-even costs the most, because every sale makes the hole deeper.

The Price

Current prices for the Kindle, paperback and hardcover editions are on Amazon, and they vary by country and format.

If you're a Kindle Unlimited member, you can read the Kindle edition at no extra cost. Not a member yet? Amazon often offers new members a free trial; check the current terms on Amazon.

The book's own reading tip is to keep Appendix D (the formulas) and Appendix J (the channel cards) open on your desk, which is what the 6 × 9 inch paperback and hardcover desk copies are for.

Imagine Your Next Campaign

Imagine a sales rep calling with a "special package", and you already know your maximum cost per lead, so you can answer in one sentence.

Imagine launching a test with every channel tracked separately: its own landing page, its own phone number, its own code. You leave it alone for three weeks instead of panicking over one bad day. Then you read the results honestly, decide whether to stop, fix or grow, and write down what you learned in a log your whole team can read.

Imagine telling your boss, your client or yourself not just what the platform reported, but what actually changed because you advertised.

That's what a method gives you. It can't guarantee results, and nobody honest can. What it gives you is a clear decision every time you spend money.

A Bonus You Can Use Today

The book's Index D maps Seowolf's free tools to media buying tasks. You don't need the book to use them:

• Cohort: plan and group audiences, segments and customer cohorts
• Sales Letter Writer: draft copy for direct mail letters, long-copy print adverts, landing pages and DRTV scripts
• Longtail: keyword ideas for search campaigns, and negatives to exclude
• SEO Audit: check a site before you send paid traffic to it
• Hosting quiz: choose hosting for landing pages that must cope with spikes from TV, radio or big campaigns

Who This Book Is (and Isn't) For

It's for you if you are:

• A business owner who spends, or plans to spend, your own money on advertising and wants to stop guessing
• A marketer managing budgets across several channels who needs one framework that works for all of them
• Agency staff or a freelancer buying media for clients who want to do it more profitably and defend your decisions
• A founder or manager who approves advertising budgets and needs to ask the right questions
• A beginner who wants a structured path from "what is a CPM?" to planning a multi-channel campaign

It's not for you if you want a step-by-step guide to one platform's buttons, or a list of "secret" traffic sources. The book deliberately names no platforms. It teaches the principles that still apply after this year's interface has changed.

Your Next Step

Every week you buy media without knowing what a customer is worth, the platforms, reps and dashboards decide for you whether it's working.

Waiting won't cost you a missed discount, because there isn't one. It costs you another month of spend you can't account for.

P.S. If you skipped straight here, here's the short version. Seowolf's Guide to Media Buying teaches strategy, maths and testing for every medium, from search and social to TV, radio, print, out-of-home and direct mail. It has 46 chapters, twenty playbooks, a bonus chapter on starting a media buying service, checklists, templates, a planning calendar and 120 test questions with answers, and every formula is worked through with numbers you can check. If you're a Kindle Unlimited member, reading it costs you nothing extra; if not, start with the free sample on Amazon. The twelve-step Start Here chapter alone will make your next test safer.

P.P.S. Whatever you decide about the book, work out your break-even ROAS tonight: 1 divided by your contribution margin. Then compare it with what your ad platform reports. Once the media is bought, the companion volume, Seowolf's Guide to Direct Response, covers the copy that has to make it pay.