Trading is a bad idea. If they added trading there are a lot of people who wouldn't even have to play and they would get everything. I had a friend who told me that he would give me a ghorn because he had seven. And I've had a lot of randoms tell me they would give me this or that if there was trading. While I would say no, a lot of people wouldn't.
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If there was trading than there will be a lot of account hacking your choice trade n loose n no trade and keep your goods
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Even people paying for good gear with real money outside of Destiny. It's just all around not a good idea.