It's not survivalist prostitution & you certainly don't need to feel sorry for them.
These figures seem low. The Thai scene dwarves the foreign scene. When I lived in Bangkok, pretty much every Thai bar, live music restaurant, night club had loads of girls who were obviously looking for business. Many of them have day jobs and go out a few times a week/month looking for company. Many of them seem to become someone's paid mistress, does that still count? Then there are all the massage shops with extras, KTV bars, side line girls on social media. Pretty much every random Thai town I've stopped in for the night has massage shops or karaoke places.