Something I don't see mentioned: I like the aesthetics of shelves of books. I enjoy perusing the shelves when I'm ready to start a new one. I also enjoy shopping used book sales. Here in San Diego, there's a huge monthly used book sale at the North Park library. Every book is $1 and under and it's actually good stuff. I'll probably only read 10% of the books I pick up, but that's okay considering the low cost of each.