I do it for youth soccer, but it's really more of a teaching position than Serious Business. Sure, the coaches try to teach the rules, but when you have 20 kids on a team, getting all of them to pay attention and absorb the info is difficult at the best of times. My rule chalk talks are usually about 3 minutes long followed by a quick practice session to drive the concept home. But even then, you can't get everything in. A good ref will explain the calls to the players in the moment, which helps them internalize them better than playing grab-ass during training.
The pay isn't great, but it keeps me active and keeps kids interested in the game.