Papa Hh might like to tell horror stories for several reasons. One, it could be a form of entertainment for him and his listeners. Two, horror stories often have a certain allure and mystery to them, and by sharing these stories, he can create an atmosphere of suspense and excitement. Three, perhaps he has a collection of such stories that he has heard over the years and wants to pass them on, as a way of keeping the tradition of horror storytelling alive.
Maybe Papa Hh likes to tell horror stories because he enjoys scaring people in a fun way.
It could be that Papa Hh has a passion for the macabre and wants to share that with others. He might find the reactions of people when they hear horror stories quite interesting. Also, horror stories can be a way to explore the darker side of human imagination, and by telling them, he gets to engage in that exploration with his audience.