There are not big bucks playing pool either.
It's not a hit job and if you ask must of the PBIA instructors they don't rely on teaching as there main source of income. Most teach sporadically. There is not big bucks in teaching pool. And I wouldn't be surprised if the lesser known PBIA instructors do have a fargo rate and do play tournaments because they probably teach because they love the game.
Also, I have to say I have learned more from Dr. Dave and Tor's videos in the past few years than anything else to help my game. I just find it odd, they don't have a fargo. Nothing more nothing less. But it could be due to that they aren't in area that uses fargo or just don't want to play tournaments.