I use Amazon’s Wish List feature often. My “Wish List” isn’t a I wish somebody would buy this for me list. It’s where I store all the book recommendations I get. As of this writing there are 217 items on my list. I’d guess 216 of them are books. I read/buy books as fast as I can, but that list grows anyway.
Why don’t I get an alert when a book is on sale? Add this feature and I would instantly buy any book on my Wish List any time it becomes a Daily Deal, and I’d likely buy others that were simply discounted to a lower price than when I added them, depending on the discount.