"If they can pull >$60K in the middle of slow-town Wisconsin while only being open "normal business hours", I'm convinced that we are patronizing a bunch of $100K girls in the densely populated places like Flushing NY."
Maybe....Maybe Not because of overcrowding competitions. For example, I chat with a C lady in Flushing every day. She stated that it is usually 0-2 customers a day during Mon-Thurs and about 5 during weekend (Fri, Sat, and Sun). That parlor will accept low-ballers to prevent mongers from going to other places. At 5 pm today, the parlor ordered take-out food and fed 5 girls (mms included). She sent video of the gathering including food because it is slow.
I think normal market forces apply at all times.
At a perfectly clean legit spot I know of in Flushing, "slow" means an average of 4 customers x 4 girls that day. There are girls that left this spa because they couldn't keep up with 7 customers a day, 5-6 days a week without their hands hurting. This is that owners third spa venture and she runs a smooth business.
I know aggressive girls that move from spa to spa that take their well-tipping clientele with them. One that I've known for 5 years that is mostly on an appointment basis and works hard to keep her calendar full. She reports $70K on her taxes working 8 hours or less per day, 5-6 days a week and takes a family vacations each year. She put in the work to make the money and that's without even providing HE.
I compare that to another FS Spa that is past its prime. The owner is only there twice a month and the current the girls don't keep the place clean. They end up scraping the bottom of the monger barrel with unhygienic guys that skip out on their tip. These FS girls struggle and only the least attractive stay there for more than a month.
My point is that you need a good environment, with an active owner and good talent to do well in most places. Otherwise, you need very limited competition like the women in the article.