Wouldn't it be great if Black Cat treasure cards were useful for crafting something? Like a panther mount, or even a souvenir statue?
Well there is a statue that is dropped and the pet can be purchased from Spooky Bob right now. I really don't see the use in crafting what is already available.
The point would be to have something fun to do with all the Black Cat treasure cards we get at Halloween. There could even be another required ingredient that you get only if you complete all the Halloween quests. And then it could even have a year, like those Christmas Tree ornaments that people collect :)