We read for the same reason we do everything else, to feel good or to escape boredom. I don't know why, but in me the fear reaction is turned way down. I guess that's a good thing. I resonate to the story of The Boy Who Couldn't Shudder. I don't feel horror.
When I was a little kid, I was scared a lot. When there was a scary scene in a movie, I would go out into the atrium and peek through the curtains -- this was back in the day when theaters had curtains. But as an adult, I've seldom been frightened, and almost never by a movie or book. The Exorcist came close.
So, I don't mind horror tropes in adventure movies or novels, but the kind of book or movie where, for example, the characters are killed off one by one, and nothing they can do can save them -- not my cup of tea.