A couple of months ago there were anywhere around 100 or 110 escorts listed regularly.  It's been declining steadily.  Now there are only sixty something listed.

Does anyone have any idea what's going on?

The economy is down. Currently, there is not enough cash flow for one hundred Eros-Boston escorts to stay in the Boston market.  Some have to drop out, ie., those whose average number of phone inquiries drops to single digits and whose completed client visits dwindles to 1, 2 or zero per day.  Other agencies and independents have seen decline, although many continue to do well.