Do you want Amazon to start a monthly subscription plan for e-books?
Audible.com offers several monthly subscription plans for audiobooks. I love having this option, as audiobooks can otherwise be very expensive, and the credits-per-month option, combined with frequent sales, gets me many books I want at great savings. (Audible is part of Amazon)
I notice when buying e-books for my Kindle, I often hold off on books I really want to read, not listen to, due to price. I figure I can get the physical book free at the library, or cheaper at a B&N sale or at Half Price books or on Ebay or Half.com or elsewhere.
If Amazon offered me a monthly plan for book credits at the right price per book, I would probably go for it. Does that appeal to anyone else? What would be a fair price for a book credit with, say, a year's subscription?