No doubt many people want trading, but I'm guessing it is in Bungie's best interest to keep you trying to get whichever weapons you desire. There's no telling how it could affect the game if it is implemented with a somewhat 'stable' economy we're having today. What I'm saying is that there are people out there with 20 Gjallarhorns, and 18 Vex Mythoclasts, and nothing to stop them from selling them on eBay, or completely screwing the 'economy' of the game with a 'money for nothing' situation. Edit: Also, they know their currencies are pretty much worthless, just ask yourself 'Would I trade my Suros Regime for vanguard marks/glimmer?' Of course you wouldn't.