They aren't "wasting" that stuff. The way retail outlets work with vendor is called "good faith". So the outlet gets returns and/or trades. The vendor will tell them to destroy the items and they will issue them credit. That outlet could be in heaps of trouble if the any of the vendors see your videos.
Why not just give it away is my question? Donate it or something. Some of those games are pretty expensive, $20+ online.
Such a waste throwing that stuff away. Should donate the games to a teen center or after school program for kids in need.