Depends entirely on how they conduct themselves, how they use their money, side hustles etc. Agency girls are lucky to see more than half the asked for rate, pimped girls can only dream of that. There's costs: if they aren't stupid, they have their taxes, their working pad, beauty treatments, outfits etc. Getting income streams from social media, videos, sugar daddies, rental home seems to help a lot and let's them retire or semi retire early
Having now personally known a few SWs, they can also go through dry spells: bad luck, change in local market, or just a voluntary break to recharge. Very few are fucking several guys a day, 5-6 days a week, every week, certainly not for very long. Others just like dipping in and out, or being part time around civvie jobs