Are any of them under 40 and completely self-supporting? Most of the coworkers I had when teaching who weren’t bothered by the money had an external source of financial support. It took me a long time to realize it because those who are supported by others don’t like to admit it. I referred to them as hobbyist teachers, and they were much much more likely to stay longer than 5 years compared to those who were doing it as a career.