And this is what happens when you pay mathematicians so little. In my department, only 3 out of the youngest 15 mathematics professors are native English speakers.
Mathematicians are generally treated quite badly by administrations who want all of those fancy engineering and NIH grants. (I was thinking of writing a proposal to fail to cure cancer. Because I can fail to cure cancer faster and cheaper than it's currently being done.) And if you are smart enough to be able to tie your own shoes, you get a grant in engineering and biology. In biology, that is an overqualification, in fact. Even travel grants are nearly impossible to come by in mathematics.
Who goes into it? Well people whose education (K-12+college) is fully subsidized and excellent, doesn't have a lot of wussmanities and PC requirements and focuses bright students on mathematics and the basics.
They come to the US for graduate school to escape the poor country they were born in and stay through the professoriate.
And that is why, Virginia, your college math teachers suck.