I don't think the world obsessed with only certain books at all. Out there, there are people who like Fantasy will read books by Piers Anthony, Anne McCaffrey, J. R. R. Tolkien, George R.R. Martin and Terry Goodkind. For me I'm a fan of realistic spy thriller, and Tom Clancy and John Le Carre my favorite authors. But I also check out certain spy novels from other authors and once in a while read nonfiction spy stuff. Some people who have been fans of the Warhammer role playing game will read all the different Warhammer novels from all the different authors that write them. There also people that will read anything they think are real good and like.
Well I can keep on going, but you get the idea. That no certain books that the world are obsessed with. It be case of what we like are very diverse.