I think a problem with affiliate links is that they can only reward people who cause sales to occur. This is good if your commentary on the book was so useful i

I think a problem with affiliate links is that they can only reward people who cause sales to occur. This is good if your commentary on the book was so useful it made someone buy the book. But what if your criticism is so useful, it caused a prospective buyer to not buy the book. You did just as much a service to him/her by providing a valuable opinion, yet you get no reward. Next to every Amazon affiliate link should be a "Donate if I convinced you not to buy" button.