There isn't anything wrong with I think. I sell/ give my games to friend first and see if they want them and after that, I put them online(Playswitch.com, Amazon, eBay, etc.). But people have a big problem with the whole, Gamestop, EB trade in, just think;
In a few years, most games will be buying most games online, like the PSN or Xbox Live, so no need to worry because we can't trade those in.