I would think gamestop should be thankful for the business. How many people actually buy games like Marvel Vs capcom, and most of them that buy games like that know the value and are just trying to get it for their collection. Not to mention it would be impossible to pick up games like MVC 2 because most of the times they are at the store but sitting in the employee hold drawer, making it impossible for the customers to get to them. Thats why I suggested it would be a waste of time to try and get every copy from the store locator. You get to the store and it simply would not be there. Calling the store only alerts them to something that is rare and hard to find, then it mysteriously disappears into the employee hold drawer, never to be touched by a customer's hands.
Obviously, my choice of MvC2 was merely one example. There are other things that resellers can buy, things aren't even that rare in a particular area, and still spin a profit, if they know how to do it. Hardware and accessories are a good example. I live in Jersey, right across the water from New York. I have tons of stores, all types of stores, within my immediate striking distance. I walk out my door, and I trip on a Target, a Toys R Us, whatever you want. Some people are not that lucky. They have to make a day trip to reach the nearest shopping center. They may or may not also be somewhat ignorant to value. So, they might resort to places like the Amazon marketplace or eBay or whatever. Again, I'm just giving examples that pop into my head. I'm not a big time reseller, so I have no clue what exactly makes them a profit. But something does, or else, no one would bother. There is money there, which is why people bother to do it.
Also, the myth that if you called a GameStop looking for something rare that it will suddenly disappear is blown out of proportion. Think about it for a second, and you'll understand why it makes no sense. If
you (and by you, I mean any "educated" gamer) worked at a GameStop, and you already knew, say, that MvC2 is extremely rare, how freaking long would it last on the rack, before you stored it away somewhere? If I worked there, the first day I arrived, I would already have the placed staked out. How about you? Exactly. From my experience, the majority of people who work at GameStop are either non-gamers or people who couldn't be bothered with knowing what games are "rare." If you called and simply asked, "Do you have this in stock?", it more than likely will still be there when you arrive. I've done with many rare items, and I have never, ever seen one of them "disappear." YMMV, of course, but this is still blown out of proportion. Of course, if someone is dumb enough to go, "Yeah, that game is really rare and goes for like $100 on eBay," well, then it might be gone.
Now, as to why GS would care about this at all, that's simple. The reseller is not the average customer. The reseller is looking to take advantage of the store for his own benefit. They also probably have zero intention of making any purchases adjacent to whatever they walked in there for. In the end, GS would prefer a product to sit on the shelf a little while longer, in hopes that the actual customer who comes to buy it will see something else and buy that, as well.