To add onto what Freak said, Pinhead, as opposed to Freddy, Jason, Michael, Chucky and Leatherface, isn't super iconic as he used to be. In part due to a lot of the recent movies in the franchise being direct to DVD bombs. Personally the first 2 Hellraiser films are fantastic and good enough for a maze. The 3rd one is okay, but it's starting with 4 where the franchise started goinh downhill. Especially since after 8, Doug Bradley stopped playing Pinhead. Thus I can kinda see why this factor makes it complicated to bring to the event in terms of popularity and how the recent movies can throw non horror fans off.