Originally Posted by JeremyR
Because they want people to buy books from them. Not borrow library books.
I think it is more complex than that. After all, all of the 'powered by Adobe Digital Editions' devices allow this, and they want/need to sell books from their respective storefronts also. Why don't their shareholders complain? Why don't they disable the feature?
On the contrary, it is a selling point, and a reason to get one of those instead of a Kindle. If you have a Nook, perhaps you only read stuff from the library, but if you do make a purchase, it is much more likely to result in a purchase from B&N than anywhere else (even though these devices are less locked in than Kindle).
Perhaps publishers are reluctant to work with Amazon by agreeing to make their titles available for borrowing in Kindle format, lest Amazon get even more leverage. Or perhaps Amazon has other priorities, given their large market share. Or maybe it is being worked on as we discuss it here.