That is true but I think the salient observation here is that it's only realistic to pay so much for education. So either you can't have children in such a town, or you're forced to homeschool, or (I guess what's being suggested is) you import someone willing to work an undesirable job if it gets them into the country.

I think there's an important difference between importing labor to undercut qualified americans in a populated area versus importing labor to do a job that the vast majority of qualified americans will have no interest in at any reasonable pay rate.

you could also export the children, or the whole family, to a place that can support teachers