Libraries and individuals are spending money on ebooks and other digital files which they may no longer have access to (because we technically don't own them) in the decades to come because of the current user agreements with Amazon and other vendors. We are all locked into these proprietary "ecosystems" of ipad, Kindle, Nook, etc. Amazon is the clear leader currently and Amazon knows everything the library patrons are checking out! A private company now has this data for the first time ever: this is not what we're accustomed to because libraries have always prized patron privacy.
Must see interview with Sarah Houghton, Librarian-in-Black from the School Library Monthly Blog: