I already commented this in response to a post.
"I think it would be a bad idea. It would have the effect Borderlands trading had. You'd get powerful green (and higher) weapons through trading and effectively lose the excitement of a nice loot drop from a boss because.... The weapon in your hand is already better than than nice sexy new weapon that just dropped from the boss you just spent a half hour fighting.
I think it would severely diminish the overall experience **cough**borderlands**cough**"
English
#feedback
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Trading should not be added at all. While I doubt Bungie will add this due to their comments already made, it would be very disappointing if they did. It would be very stupid to answer someone if they asked you where you got your exotic rifle and all you said was "a friend traded me it". I would much rather say "I earned this from defeating (boss name) with all my friends doing that strike mission in record speed"