if your highest performing ad is against searches for literally the title of your book, isn't that a signal that you don't need to buy ads? people are searching for your book. they will buy it whether you advertise or not. so why by the ad?

this is framed as amazon doing something wrong, but it sounds like what's actually happening is that his marketer is wasting money. of course amazon is going to accept money if you give it to them for the things they're already doing for free. why shouldn't they?