I can't imagine myself holding a kindle or any other tablet-like reading device and reading books that way, unless a book I want to read is somehow prohibitively expensive (which again comes down to what I said in my first comment, money.)

Plus, I can't build a nice, physical library with a bunch of pdf and epub files. You might say that having a physical library is stroking one's ego a bit, which I agree with, but hey, it's an ability that's exclusive to physical books and not electronic files stored in some drive. And so is using books to prop stuff up, but that's mostly used with books one thinks are not of good quality and don't deserve to be read/read again.