How about a forum or thread where people trade their old and unwanted games with other users here?
It might work. It might not because everyone will want to trade up and because it'll be hard to find a 1-1 match. But it is a decent idea.
If not, I am trying swaptree and goozex to get rid of my games I don't want.
Like I said, I think people will trade up but here is my request and offer list.
Requests (1 for 1 trade)
Wii play w/remote
call of duty 3
need for speed carbon
prince of persia
I might stick go goozex (example, prince of persia is worth 700 points, but call of duty 3 is only 450 so I end up better selling it there).
But I think trading here could be a good idea to exchange unwanted games.