Perhaps the best way to find good teachers is to find people who do it for social reasons, to have an impact, or for the appreciation of their peers, rather than the money. Even if it's on a part-time basis.
I'm not sure part-time would work for elementary school, but past that? I think it would work.
Your statement reminds me in a way of Diogenes of Sinope[1]:
The most scandalous of these activities involves his masturbation in the marketplace, to which he responded he wished it were as easy to relieve hunger by rubbing an empty stomach.
On that note I did come across Udemy[1] the other day - which is something similar and looks like it will let you offer paid-for courses in the future (paid courses seem on a limited trial atm).
I be dammed if I can remember his name now, but there was a famous mathematician, who used to travel around to different universities, sleeping there and working on papers with the other professors.
Some people can leverage karma points into employment. It usually is a decent proxy for determining that someone is a known and valuable member of a community, which counts for a lot.
