Apparently, taking exclusive stuff for themselves and selling it on eBay is officially a PERK of working for Gamestop and EB Games, according to the manager of an Illinois store.
From the article: "Anyway, I asked to check out the Master Chief figure behind the counter. I just wanted to see what it looked like, I wasn't really interested in buying it. The store employee eagerly obliged. After checking the figure out, I said to no one in particular, "this isn't as cool as I thought they'd be." Both store employees agreed. One, who I presume was the manager, as he was overriding a transaction for the other employee, said, "Yeah, he isn't that cool, but the Cortana figure is really awesome!"
Intrigued, I asked to see that figure. He looked up with a grin and said, "we don't have any of those anymore." The other employee asked the manager why. As I was browsing some of the games, I heard the manager say:
"We only got one dude and I picked that one up right away."