When you're dealing with fraud in the tens of thousands of dollars, massive fines and jail time are possibilities. I'd have a ton of shills on the payroll right now if I were him...
He paid one guy a thousand bucks to shill. How many people do you think would do the same job for $100?
Well I would say that if someone were to be willing to receive $1,000 in exchange for silence I would think he would also be willing to keep quiet about the fact that he received as much money.
A lot of people shill out their signature for a lot less then $100 all the time.