Truth is every last company on earth wants to monopolize and lock its customers. There's a reason why king of pretend-openness Google doesn't support carddav and caldav
It's the publishers that have handed Amazon their (near) monopoly on ebooks. If they wouldn't have insisted on DRM or at least had insisted on non-proprietary DRM, you would be able to buy books anywhere and read them anywhere.
I prefer reading on my Kindle to paper books but I also love browsing and supporting book stores and the people who work there. I've always wished that I could browse a bookstore, take a stack of books to the front and have them scan a QR code (or something like that) on my ereader and sell me digital copies of books rather than the paper copies.