Ah, retail. Once I had a lady call and ask about a Yu-Gi-Oh tourney. (I worked retail for WotC) I told her pre-reg started at 5 and it was first come first serve; we could only accept 40 participants per game. The tournament would start at 6. So she gets there at 6:20 and demands that her son be let in because I had promised that he would be allowed to play, and that she had driven down from PA for this. My manager (who had been listening to our phone conversation) explained that late entries weren't allowed, and that we had turned people away because we had been full booked since 5:20. She was not a happy camper. She made threats, and threw quite the fit until we had to ask her to leave the store. She called my boss' boss' boss' boss to complain, which meant that everyone down the chain got in trouble, but nothing came out of it. There was nothing we could do.
The Iron Hand doesn't work. It just makes the retail employees less happy to help you.