I think it's important to distinguish between different categories of providers.
--The rub-and-tug women are probably making a LOT less than the FS AMP ones.
--There are plenty of Korean and other Asian women who bounce around as free agents from AMP to AMP and city to city, take time off when they want, make a great living, and don't have anyone with financial hooks into them, but often are hurt by the crappy choices some of them make (investing all their money in starting a small business or in cybercurrency)
--There are sadly others who are here illegally and with massive obligations to unscrupulous people, and that's the fu---ed-up side of this sector, which I avoid if I even get a whiff of it.
So the economics of this vary enormously.