Problems with this story:
1) 10 copies of any of the games in the ad in stock in store at any one time, even early sunday
2) a Best Buy manager giving enough of a )(&%^ to go on his personal lunch break to Walmart to perhaps find someone doing whatever
3) lo and behold finding not one or two but THREE nefarious characters out to screw corporate america in line AT THE SAME TIME AND PLACE on the managers lunch break
4) the charlatans openly having a conversation on how they were going to spend their ill gotten gains.
It seems that every time there is a decent sale, there will be posters who claim to witness first hand unbelievable feats of hoarding. Like you stated: such as one Best Buy having enough games to support not one, not two but three different hoarders (10 Pokemon X, 10 Yoshi's Island each)? There are also the people who claim to witness CART LOADs of games being purchased from other sales.
There were numerous members who had "scouted out" the 3DS games at their Best Buys last week in preparation for the sale and the consensus was pretty much that there were not very many of the promo games at any of the stores. Yet, there's this mythical Best Buy that has 30+ copies of each title.
I go first day to most sales and have never witnessed a cart load of games being purchased. The closest thing I saw was the "Wii shuffle" when people literally ran in and out of the stores to try to get a Wii.