One thing is for sure, any post above that contains a sentence that starts with "They all..." is pure BS.
There are many kinds of businesses reviewed here, the upscale FS AMPS, the dingy basement FHs in Sunset Park, the HE only places, etc. Within those places there are many different women from many different places with many different motivations.
I'm not that prolific, and most of the women I see are UTRs, a few of whom I met in "the business" but no longer are. But, over the years I've made a few friends, gotten to know their personal stories. A few I'm friends enough with and meet just to hang out, i.e. we never fuck but might meet on a nice day and sit in the park and schmooze. Their backgrounds and origin stories are quite varied. Some are sad to hear, some are not. Some of these women are living the life they're looking for, doing and experiencing things their contemporaries back home cannot. (E.g. take a group trip to Yellowstone.) Some are not, they're only doing this to send money back to family or save up to buy a house back home. Some have addictions and are blowing it all away on cocaine and hook... handbags. Some have raised a family here, including kids who've graduated college. At least one told me she was saving up for school here, with quite specific realistic details, and given how articulate and intelligent she seems, not to mention how young she seems to be, I can believe her.
Whatever their origin story is, the only thing they seem to have in common now is that they're different. And almost all are immigrants.