What do you think about the idea for an in-game "craigslist" for weapons and guns? Where you can post a gun, and receive a set number of offers, like ten. You look though the offers and accept/decline them, you can include shaders, armor, ships and sparrows in this system.
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I wouldn't mind being able to trade with others on my friend list, but that's as far as I would like it to go.no selling, no auction houses.