As boys we also told ghost stories in order to excite ourselves. However, from my observations fear and sexual arousal seem to be more closely correlated in women than it is in men, and it can be an easy move from fear to arousal. As a result, horror is the most popular film and profitable genre, and that audience is mainly young people.
It is not surprising that occult games are popular among that age group as well as they provide the same kind of stimulating arousal in a basically chaste but not necessarily non-sexual environment.