Honestly, I'm already "locked" into the Amazon world by them having the best e-book reader that I've owned for years (though removing DRM from Kindle books is very easy).
I'm very unlikely to ever read this type of book again after I finish it, so needing it on a non-Kindle format if I were to ever switch to another e-reader is not that important. And unless there's a lucrative, legal resale market for e-books that I'm unaware of, there is really no point in even keeping the file around once I'm done reading the book.
