Ok so, trading will come and this is why I think that : Bungie wouldn't put trading in the name of the company. This is done on purpose to get us talking. They tell us about the emotes and the silver currency. My guess is that they will see how much of a success microtransactions are then they will let you purchase silver from the microtransactions. With the silver you can buy an item called something like ' a traders coin' or 'swap scroll' that you use to receive an item from another guardian. Or they'd have a 'used vendor' where a guardian can sell an item from their inventory, and the amount of silver received was based on the condition, ie the level of current upgrade. Then the used vendor sells it onto another guardian for a denomination of silver. Seems like they'd be happy to financially benefit from the kindness of another guardian willing to donate some of their inventory.