Interesting question!
1) Apps are licensed as well.
http://www.apple.com/legal/itunes/ap.../us/terms.html
Quote:
LICENSE OF PRODUCTS. The software products made available through the Service (the “Products”) are licensed, not sold, to you.
|
So, if you buy into Amazon's premise of licensed, not sold books, then Apps would follow the same reasoning.
2) As far as the practicality of it-I guess what you are in effect doing is selling your account as well? Just without the credit card? Not sure how Apple would ever know it wasn't you still managing that account, assuming it basically "died" in terms of new purchases, and the buyer used your old account just to access the books.