Personally, I like the idea of in-game trading. I appreciate grinding for your stuff, but hear me out. If I buy an exotic engram for my titan and it's hunter gear and my friend buys one for his hunter and gets titan gear, we should be able to trade them. We did pay the exact same amount for them. Also, if 2 guys raid together and need different pieces of armor to get to 32 and they both get what the other needs and don't get what they themselves need, they should be able to trade. The grind was the same for both players in that case. I don't think we need a fair trade mediator, though. How I do my business should be no one else's concern and it's up to me to negotiate a good deal.