DRM will always be a thorny issue. If you buy a paperback (usually for a similar price) you can do what you want with it, you can give it away, lend it or sell it. With an ebook you can't do any of these things. I can't even put one of my books on my partner's e-reader.
I've always wondered what authors think of e-books. They might get more sales, but I discovered many of the authors I like through second hand and borrowed books.