Not talking my tastes - clearly fighters don't resonate with me anymore with how ADHD they've gotten (remember I was a VF fan - SF/Marvel are still in my "bane" range, personally) - talking EVERYONE'S tastes. They don't even sell well enough to be plentiful anymore, remember there used to be two or three coming out a month back during N64/PS1/PS2/DC eras because the genre was popular? Now there's just slightly beyond that a YEAR - that dropoff doesn't occur unless people just aren't buying the games, which they're not.
They're college games mostly - once you're out of dorm age the number seem to drop off drastically from what I've seen. (And the occasional person trying to relive college days - like our Shadowrun GM who let us try KI at his place - he's making $75k in a $1300/mo apartment and is looking for a third roommate for his place because he wants people around living with him, not because he needs the financial support... [hell, he was offering to buy me a new car to replace mine when I was whining about having to get it repaired because he thought I meant it was going to break the bank for me... when I just find the whole process annoying not because the money is an issue... he's clearly got cash to burn...])