Usually, in an educational process, it's the teachers who get paid, and the students who have to pay to get educated. I realize this is somewhat different because we want to encourage people to get involved in the project, but it still seems weird.
This is probably a good point. I've never mentored, taught, authored a patch or review, so I can say what is similar or different.
People sometimes do a lousy job now too, but at least we can count on the fact that everyone who signs up to do it has some intrinsic motivation.