For anyone who is considering a potential legal response, unfortunately there are statutes of limitation for suing someone (that is, a lawsuit has to be filed within a certain period of time after the act). These vary by state. You also run into the problem of suing someone across state lines, which will almost certainly require a lawyer and the associated fees. All of that means time, effort, and additional expense.
On the other hand, just from looking at this thread, I wonder if his conduct doesn't cross over from civil breach of contract to criminal fraud. If so, the state Attorney General's Office where he's located might be interested...