Spot1990 said:
I'm pretty sure bigger retailers (gamestop, etc.) buy in large quantities and once they reach a certain quota their entitled to return any excess stock.
Indeed.
That is one thing that was missed in a lot of these posts. The Original Poster seems under the impression that since the stores bought the game, that the developers, publishers, and every one else has already been paid.
However, in a lot of cases, those stores have an arrangement, that under certain circumstances the stores can ship the game back to the distributor, and get their money back essentially.
Side note, while DVD's and video games get sent back complete, books and magazines only require that the cover gets sent back. A lot of books and magazines end up in the trash at retailers, but as long as they send the covers back, the store gets a refund for their purchase.