Guys...
Alice Cooper got houses because 1) his brand is extremely horror-heavy and helped define shock rock, and 2) more importantly, the creative director of Hollywood's Horror Nights -- who at this point in time had an outsized influence and on what made it into the lineup -- idolizes the artist.
Slash also benefits from #2, but crucially, he never headlined a house. He was a "bonus" marketing element for Clowns and the Monsters mazes. Not the same thing as leading a maze, which to date, has only happened with Cooper, Black Sabbath (which had a bit of a muted reception), and The Weekend -- all three of which are huge acts. (Yes, I'm aware Rob Zombie got to do what became House of 1000 Corpses in an earlier iteration of the event. I think we can all agree the current iteration of HHN has gone in a different direction when it comes to choosing what to feature.)
KISS is a huge, iconic act, but it's not immediately associated with horror, even with the face paint. What are they going to adapt, the forgotten Phantom of the Park TV movie? Can we please be serious?
Rob Zombie's movies made it in because he makes horror movies. Why are you saying he isn't relevant "because he's a move director" as if that isn't extremely relevant for an event that centers on haunt adaptations of horror movies?
Anyway, Universal Monsters: Eternal Bloodlines... in Orlando...
(Please do not "wow" react to this post.)