Something to think about. Kindle owners are not the only people who are breaking DRM. There are tools for all the current ebook formats (except iBooks for now) and they are being used by owners of all kinds of devices. Even ePub has it's various DRM flavors. Don't get "locked" (

) into the idea that Kindle owners are the only ons using the tools available.
I would say 97% of the books I read on my Kindles are from Amazon (IMO they still tend to have the best selection and prices). I still read them in their DRM'd form BUT I store them without DRM in mobi and ePub formats. Those books I purchase or freebie downloads from elsewhere may be read on my Sony and stored as DRM free mobi and ePub (books in Secure eReader get stripped and converted since neither my Kindle or Sony will read them).