Seems to me that the rip-off artists are starting to get greedy.  Probably encouraged by success in their teaser rates of $160-220, they are upping prices, bypassing the newbie bottom-fishers that are their bread & butter.

This might start to backfire on them in unsuspected ways.  It is one thing to charge $200 +/-, where the unsuspecting/unwary traveler probably just writes it off to experience, while kicking themselves in the rear (the typical tourist is unlikely to make a fuss).  Its another thing to charge $300 & up - you're starting to get into serious money.  The target clientele is more sophisticated and expects something for their money (less likely to meekly accept their fate; and legitimate interests might see a need to start protecting themselves from also being tarred as rip-offs).

Other commonalities in rip-off ads seem to be:  Many are more mature providers,  Pictures don't reveal any 'nudity', Ad text is generic, saying nothing explicit, and Pics are stolen (no tin-eye 'hits' doesn't mean they aren't lifted from somewhere else - found Caroline's stolen pics from sometime ago with 'Bing' search.