It's like an infinite amount of monsters and beasts to choose from, whether based on the creative minds of the event, or focusing on old legends or myths to bring to the event. Yet, like I said earlier, I understand that with original concepts, they're sort of gambling because they know that utilizing popular properties (Saw, Insidious, Halloween, TCM, Friday the 13th, etc..) will for sure bring in crowds, even if they've seen these before.