It's not as though improv teachers are walking around buying luxury vehicles, though. The classes are as expensive as they need to be for the instructors to eat.

There's nothing stopping people from starting up a community improv troupe without formal training from a teacher, just as you don't need someone with an MFA in Performance to start a community theater group. There are enough books out there on the art form that a dedicated group could learn the necessary techniques on their own.

And high-level youth soccer can be way more expensive than even UCB-level improv classes.