For books of no particular interest, my local second-hand bookstore has a shelf which sells books at 10 cents each. And it gets refilled quite often!
You may really underestimate the demand here.
Also, yes, we want to live in a world where things are not made disposable. The longer we can maintain what we have, the less waste we produce and the less overproduction we need to rely on. It's sustainability 101.

