But my guess is the odds of this happening in the US are very long. It's more likely to be a model for use in other countries where prostitution is already legal.

Working under a contract, these SWs are probably not making more than 200 euro per hour.

Greed. Over here we have a serious problem of hypocrisy, double standard and legalized corruption in which certain people never get punished for their misdeeds. Our tax money wasted on wars and other bullshit that make some people wealthier while the majority poorer. And they get away with it because they  brainwashe a great number of people to believe they are something that they are not,and that everything they do benefits them above everyone else, thus keeping the bullshit going.  
Adult sex work must be legalized - many civilians jobs don't pay a living wage.

These dumbasses that run America year in year out  ,claimed to have morals ,yet  legalized corruption, particularly in the form of political donations gave them pretty much everything they own.

Here is another article on the topic.

They also have a 50% tax rate starting on income over about $50k