Those that can, do - and those that can't, teach.
Teaching is rewarding which is why people do it, but you're asking them to take less pay for what is often a harder job - convincing kids to learn something when they have dozens of other things competing for their interest. The math aligns on the side with the teacher having the knowledge you would expect in this scenario - with a fair number of teachers not as much knowledge as one would hope they would have. On the students side, if they are bright then this is a soft-skill learning opportunity - how to navigate knowing more than your superior to the benefit of you both.