Well, seriously, I would really advice you to lodge a police report with the Commercial Crimes Department, let the police nail this fella, I'm sure the admin has his IP logged here and with all the supporting evidence you have on hand, I'm sure you'll get his busted. $700 is a lot of money to loose, maybe not to some but I hate seeing getting cheated of their hard earned money. Seriously, make a police report, I would if I were in your shoes.