> There are typically 3 articles published per day, and most pages have more than one article, but for the most conservative number of ad impressions let's assu

> There are typically 3 articles published per day, and most pages have more than one article, but for the most conservative number of ad impressions let's assume one article per page, yielding 6 ads per page. At 3M page views per month, this is about 18M affiliate ads served per month, or 216M impressions per year. It's cute that the author thinks number of links = "impressions" and that it has some sort of effect on the number of sales. In reality it's mostly the same people viewing the site every day and very few will end up buying a book, even fewer from the affiliate link (there appears to also always be a link for finding it in your local public library). You could put 100 links in a post and have no more sales than with 1, what matters is if your readers find the book interesting enough to want to pay to read it.