I'm not picky, I'll read anything if it's good.
I try to avoid buying paper book but I borrow them from the library or from my mother, who reads a lot. I'll buy a book if I really want it and can't find in in e-form, or sometimes just on a whim. Not so long ago I bought a paper version of a public domain book I already had for free on my Opus. But that was a special case, the book is about art history and the photos/reproductions are a big part of it.