Should Self-Published Authors Use Amazon Ads?

What Amazon Ads are

Amazon Ads (formerly known as Amazon Marketing Services, or AMS, among authors) is Amazon's own advertising platform, allowing authors and publishers to pay for their book to appear in sponsored positions within Amazon search results and on other book pages. At the time of writing, the main ad types available to KDP authors include Sponsored Products (appearing in search results and product pages) and Sponsored Brands, with the exact options and terminology set by Amazon and subject to change.

Because Amazon controls this platform entirely, its features, minimum spends, targeting options and reporting can change without much notice. Always check Amazon Advertising's current help documentation before setting up or relying on a specific feature.

When ads can help

Amazon Ads tend to help most when they put an already-converting book in front of more of the right readers: people actively searching for books like it, or browsing similar titles. Ads are a way of buying visibility for a book that is ready to be seen, not a way of creating interest in a book that is not yet ready.

Product-page conversion comes first

Every pound spent on Amazon Ads sends a potential reader to the book's product page. If that page does not convert browsers into buyers, advertising simply increases the number of people who see a page that does not persuade them, which is an expensive way to learn that something about the page needs work.

Cover

A cover that does not immediately signal its genre is one of the most common reasons a product page underperforms once ad traffic arrives. Readers browsing a genre category form snap judgements from thumbnails; a cover that reads as the wrong genre, even if well designed in isolation, works against conversion.

Reviews

A visible base of genuine reviews helps a browsing reader trust an unfamiliar book enough to buy it. A book with very few or no reviews can still sell, but it typically needs everything else on the page working especially well to compensate, since readers often use review counts as a quick trust signal.

Metadata

Categories and keywords determine, in part, which searches and browse pages a book (and its ads) can appear against. Metadata that does not match what the book actually is can bring in the wrong readers through ads, who then bounce off the page without buying, which wastes ad spend regardless of how good the page itself is.

Price

Pricing that sits well outside what readers in a genre normally expect to pay can undermine an otherwise strong page, whether the price is unusually high or, in some cases, unusually low in a way that reads as a signal about quality. Genre norms shift over time and vary by format, so check current comparable titles rather than assuming a fixed rule.

Profit margin

Before setting any ad budget, work out the actual royalty received per sale, after Amazon's share and, for print, printing costs, so that ad spend can be judged against real numbers rather than the cover price. A book earning a modest royalty per copy needs a correspondingly cautious view of what it can sustainably spend to acquire each sale.

Single book versus series

Authors with a series sometimes have more room to spend on advertising a first book, because a reader who buys book one and enjoys it may go on to buy further books, spreading the value of that initial ad spend across more than one sale. A single standalone title carries all the weight of the ad spend on its own royalty, which tends to call for more conservative budgeting.

Budget

There is no universal starting budget that suits every author or genre; what matters is starting at a level you are comfortable losing while you learn how a campaign performs, and increasing spend gradually only once you have evidence that it is working for that particular book.

Testing

Running more than one small campaign, or testing a small number of variables such as different keywords or targets, over a defined period, gives more useful information than a single large campaign run indefinitely. Change one meaningful thing at a time where possible, so you can tell what actually affected performance.

Keywords and targets

At the time of writing, Amazon Ads allows authors to target specific keywords, product categories or comparable titles, depending on campaign type. The exact targeting options, and how each is best used, are set by Amazon and do change, so check Amazon Advertising's current guidance for authors rather than relying on older explanations of how targeting works.

Automatic versus manual campaigns, where currently relevant

Amazon has historically offered both automatic campaigns, where Amazon chooses targets on the advertiser's behalf, and manual campaigns, where the author chooses specific keywords or products to target. Whether both options remain available, and how they currently work, should be checked against Amazon's current advertising documentation, since campaign types and defaults can be updated.

Metrics worth watching

Amazon Ads reporting typically shows figures such as impressions, clicks and spend, alongside sales attributed to the campaign. Reviewing these figures over a sensible period, rather than reacting to a single day, gives a more honest picture of whether a campaign is working.

ACoS, where relevant

ACoS (Advertising Cost of Sales) is a metric some authors use to compare ad spend against attributed sales revenue, generally calculated as ad spend divided by attributed sales, expressed as a percentage. Whether a given ACoS is "good" depends entirely on an individual book's margin and goals, and Amazon's own reporting and definitions can change, so check current Amazon Advertising documentation for exactly how any metric shown in your dashboard is calculated.

Break-even thinking

A useful habit is to work out, roughly, how much can be spent acquiring a single sale before that sale stops being worthwhile, given the royalty earned. This does not need to be a complex model; it simply keeps ad spend anchored to real numbers rather than to hope.

When to stop

If a campaign consistently spends more than the royalties it generates, over a period long enough to be meaningful for that genre and price point, that is a reasonable signal to pause and reconsider, either by changing targeting, improving the product page, or stopping that campaign altogether rather than continuing on the assumption that it will eventually turn around.

Why ads cannot rescue a weak offer

For example, a book with an unclear cover, a description that buries its hook, and only one or two reviews is unlikely to convert well no matter how many readers see it through ads; the advertising spend in that case mostly pays to demonstrate that the page itself needs work. Fixing the page first, then testing ads, is a more efficient order of operations than advertising a page that is not yet ready.

Where Quill & Reed fits in

Some authors prefer not to manage Amazon Ads campaigns themselves, particularly while learning the basics of how the platform works. Quill & Reed's Managed Author package includes basic ads management as part of its ongoing support; it does not replace the need for a book's cover, description and reviews to already be in good shape, since no amount of campaign management can substitute for that groundwork.

Common mistakes

• Advertising before the product page converts. Spending on ads to drive traffic to a page with a weak cover, description or too few reviews, rather than fixing the page first.
• Setting a budget without knowing the margin. Spending on ads without first working out the royalty earned per sale, which makes it impossible to judge whether spend is sustainable.
• Changing several things at once. Adjusting keywords, budget and targeting simultaneously, which makes it hard to tell what actually changed performance.
• Judging a campaign after a single day. Reacting to very short-term results rather than reviewing performance over a period long enough to be meaningful.
• Assuming ads work the same way they used to. Relying on outdated advice about campaign types or targeting rather than checking Amazon's current documentation.

Frequently asked questions