I think the raids are crazy now because they are targetting, not prostitutes (which is not illegal), but foreigners who are here and who shouldn't be working in illegal activities like massage (due to visa restrictions).
In other words, I believe if a massage joint exists that is run by locals only, has no pimps or OKTs, does not advertise, the police have no grounds to raid them, even if they provide special services. Unfortunately, I doubt locals would be keen to work in this line!