The fewer people who are capable at something, the more lucrative it is to know that thing. The more lucrative it is to know something, the more of a pay cut it

The fewer people who are capable at something, the more lucrative it is to know that thing. The more lucrative it is to know something, the more of a pay cut it takes to teach it, assuming teacher pay at this level isn't subject dependent. The more of a pay cut it takes to teach, the fewer the skilled people willing to take a pay cut, and the fewer teachers there are with those skills. The fewer teachers there are with this skill, the worse the students turn out at it, leading to fewer people who are capable at it. It's a vicious cycle. I'm a data scientist in SF and I'd make 5-10x less if I taught grade school.