I don't do it for the money, but I wouldn't do it for free, either.
I won't be taking many (if any) middle school games here next year because it's not worth getting off work 2 hours early to work for $12.50/game. That's college intramural wages, I think, but you'd have to ask one of our other regular posters for that.
AAU pays $27.50/game here, and that's the same age level that pays $12.50 when tied to the schools. Not coincidentally, the AAU stuff is far more competitive and higher quality ball.
I'll probably be picking up some more this weekend; I'll be interested to see how the coaches I T'd last weekend behave.