this site is the real deal... it works alot like ebay... you sell your items on there for credits then you buy stuff you want for credits....
btw i just got my Red Dead Redemption: Undead Nightmare (PS3) game yesterday thanks to listia.... completely free, even the shipping... it costs me almost 8,000 credits.... how did i get 8000 credits? well i sold some free DLC stuff i got thanks to cheap ass gamers, like stuff you get for liking their facebook page (Darksiders 2 promo stuff, like the axe, the xbox shirt, ect), and some of those little big planet karting beta keys that you could get for free from gamespot... lol.... gotta love it!