These types of stories are what in the newspaper publishing world are called "feature" or "human interest" as opposed to "hard news." I could see editors arguing that the fact that such "ghost hunters" exist and get regular calls from people makes a story in and of itself, whether or not there are such things as ghosts--especially at this time of year. Remember, a lot of these networks also pass off "celebrity" news as news coverage when this is really nothing more than entertainment, and they don't limit this to just one season.