That will never happen. If there is one thing you can guarantee in this world, it is that people can and [b]WILL[/b] find ways to exploit and abuse just about anything you can put in front of them. Not even Valve could impliment a trading system in Team Fortress 2 without running into a truckload of problems, like players duplicating/cloning items with glitches, a black market where highly desired items were being sold for hundreds - if not thousands of dollars through paypal transactions, people getting scammed, people abusing customer service to get rare items, people creating fake mule accounts to farm goodies and trade those up to their main account... There was no end to it, and some of that stuff still goes on today. You really think BUNGIE can pull off a stable trade economy, let alone ACTIVISION allowing such a thing? You make me laugh. Destiny is simply not cut out for a trading system in the game's current state. I know it sucks, but them's the breaks.