Personally i think its a good idea, just so that you can help friends who have just started by giving them materials and weapons you don't use. What do you think?
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Kid starts game friend gives him every extra exotic he owns . Kid now goes and trades the extra ones he got for the rest of the collection Kid has every exotic in game within 6 hours playing time and garbage as blam! This is why I would NEVER want trading in destiny. Go play the game and pray for rng