Loads of children read books about dinosaurs, underwater monsters, dragons, witches, aliens, and robots. Essentially, the people who read SF, fantasy and horror haven't grown out of enjoying the strange and weird.
China MievilleSubby Subby Subby," whispered Goss. "Keep those little bells on your slippers as quiet as you can. Sparklehorse and Starpink have managed to creep out of Apple Palace past all the monkeyfish, but if we're silent as tiny goblins we can surprise them and then all frolic off together in the Meadow of Happy Kites.
China Mieville