I've noticed that all the ads get pulled just before new providers post their ads. Sometimes its a couple hours, others a few days...

...spam-like Asian agency-posing as independent (using fake pics) ads.  
Upstate NY, Nebraska, Iowa etc too.

I was thinking of calling one of the new numbers for Asian providers in Portland, really servicing South Portland though.  So checked the blotter and lo and behold, a ton of arrests for prostitution.  I'm not saying it had to be those Asian ads, but with one good known one leaving and new ones there not yet reviewed, it seems suspicious to me.  

And if not the Asian ads, someone in there is attracting bait....