If you're wondering why something is on the Hotness, ask here, and maybe someone will answer.
For today, I'll just note that the following were on sale yesterday: Oceanos Amerigo The Big Book of Madness Zombicide: Black Plague Tokaido H.P.: Hogwarts Battle Chicago Express The Others Claustrophobia Battlelore 2.0 Escape: TCotT Alhambra
I feel like this has been attempted before - maybe with a thread in BGG Community or someplace like that.
Anyway - one alternative if you have a questions about why-hotness for a particular game is to ask in that game's General forum. I've wondered that a few things and I think they've always managed to solve the mystery (sale somewhere, kickstarter of some type, that sort of thing).