I was stuffing my face in the lunch room just now and realized that one thing that rocks about books (there are so many) is that there are no ads. You buy it, you own it, you take it home, you read it and no one bugs you to send them more money. No one threatens to cut off your access. No one is shoving ads or surveys at you and there are no annoying flashing animations or noises.
Just you, the pages, and some light.