Actually, I think the fact that the referral is payable after any purchase is a red herring. The review author is incentivised by their Amazon Affiliate status to choose words that will make me click on their link and get that money-making tracking cookie into my browser. Criticism of the book would not be conducive to that goal.

I think this blog is an egregious blurring of the line between content and advertising. I urge you to go and look at its archive of posts. Every post somehow contrives to include at least one Amazon referral link. Svbtle is a business looking for a long-term business model, and I sincerely hope this isn't it.