September marks the anniversary of .Pro’s big rule change.
Three years ago, the .Pro registry relaxed the restrictions for registering a .Pro, starting a surge in registrations that has continued unabated for three years. A license is still required but the license credentials are no longer collected at the time of registration.
So, the drop for September is bigger than normal. With a healthly aftermarket, many of these are snapped up at auction, such as crowdsource.pro and latinos.pro
For a full list, see http://www.encirca.com/cgi-bin/auctions/list.cgi