Yo Fletch,
May it's time for guys like you to do something.
Try to get a location of this guy and file a suit in small claims court. It's will cost you a few bucks to file (anywhere from 0$ to $80 depending on where you live and then about $25 to get him served); but maybe through the process you will figure out a way to get these people. You probably will not get the first guy but you will probably learn how to get the next one.
It's getting tough to make money and stopping these rip offs might pay off for you in the long run. You definately would have made money from the templates sales that the copy cat sold.