So I saw this video on the forums. It's a great video overall but a lot of people ask why we don't have trading and at 8:41 in the video he tell's you pretty much why. Overall a great video might answer some things you were wondering about as well.
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Ok so I thought something up I think it's a great idea hope you guys do to! http://www.bungie.net/en/Forum/Post/93338478