Mark, if a non-FFL holder goes to the show and buys a gun there and turns around and sells it there for a profit, I am fairly sure that person is committing a crime. Probably, two crimes because I doubt seriously they are reporting that profit on their taxes.
Not necessarily.
I think if the ATF and IRS were going to go after anyone, they'd start with non-FFL individuals who setup tables and buy and sell guns every weekend.