on A Marketing Expert:

Amazon book promotion is already tough enough without having to wrestle your book page into submission, too. With Amazon book pages getting increasingly more cluttered it’s harder to find your book amongst the clutter of ads, side bar stuff, and anything else Amazon is trying to push.
Most of you who read this blog regularly probably know what an Amazon book promotion pet peeve this is for me, in fact I’m kind of a fanatic about keeping that book page clean and user-friendly. This “look” includes your also-boughts – that ribbon of books sandwiched somewhere between your book description, sponsored posts, and whatever else Amazon is trying to push to your reader.