HHN is the reason the parks lasted long enough to win Potter and become contenders in the Orlando market. Kind of have to accept it has a rabid fanbase. Although I'd say at this point, its number of mainstream fans has overtaken even Food & Wine. No matter what else might open, the Orlando theme park year revolves around HHN.
I'm surprised UOR or someone else hasn't tried to clone the basic concept--a temporary adults-only theme park product with a half dozen or more E-tickets. Not necessarily Halloween, tho another theme doesn't jump to mind right away. The amount of tickets they sell in that short, traditionally slow time of year just boggles the mind.