Well, more and more shops are popping up everywhere, new girls are being advertised all the time...
Seems that despite the constant whinging in this forum about for example "....shit services, ridiculous prices and high risks...", it's still a successful enough business model for owners and staff, and that either there is a terrible 'massage addiction' epidemic happening, or more than enough people find service quality and prices still acceptable.
And the risk of getting caught in a bust in a random massage joint on a random day is negligible.