What do you mean, "the nerve of them?" More like the nerve of him, buying three copies of a game to sell online. He did not deserve three of them. There were probably people in the store that wanted to get a copy and now they cannot because of a selfish person.
I don't really agree with hating people who buy multiple copies. I do it since I buy my brothers the same game so we can play co-op and just so they have a copy for themselves (I live 1 hour away from them). Some people sell games. I see it no different than working a 9 - 5 job either. Heck, I made more selling on eBay than any of my 3 jobs I had last year according to my taxes.
Anyways, regardless of either of our views on it, their policy allows people to buy multiple of one product. They shouldn't go against it just b/c they want to buy it for themselves or feel he doesn't deserve it no matter what he does with them.