Presumably if it is effective enough people might start their search for a book on the site and if so why not finish it there? The vertical integration is fairl

Presumably if it is effective enough people might start their search for a book on the site and if so why not finish it there? The vertical integration is fairly obvious you basically need a buy link and a way to deliver. With kindle if I understand correctly all you need is the email address required to send to it. If you had enough customers you could work with other ebook reader hardware as well.