While I don't agree with your premise (I think there are plenty of high quality fiction books out there such that if you read 20-40 a year you could read pretty

While I don't agree with your premise (I think there are plenty of high quality fiction books out there such that if you read 20-40 a year you could read pretty much only great fiction for a lifetime), more importantly is that I'm not talking just about fiction. Why not read into a nonfiction topic just for interest's sake, like a layman's accessible book on quantum physics, or the battles of WWII, or the development of Western music, or whatever topic makes one just go "Hmm, that's cool, I want to find out more about that."