This is a big one, a lot of Amazon is designed around making it really easy to make impulsive purchases. One-click purchases? One-day/same-day delivery? The myriad of suggested/related items on every page between search and checkout? I can see where there'd be a big drop of orders that would never be placed again.
I really agree with you
This is why I always put books on the save-for-later list for at least a few days.
It just happened to me, I was trying to search a book and want to buy it, but since I can't search, I didn't. And now I don't want to buy it anymore