Nice to see a thoughtful post on the matter of trading. My thoughts? Dropping/trading items like white upgrade materials, ammo packs and glimmer boosts should be implemented now. Tired of the one guy in the nightfall running out and realizing he forgot to top up in the tower before the run. No trade on exotics. Full stop. Some sort of limit on legendaries (one a week, no vendor items like you said, upgrade materials stripped out and refunded so no option to pay others to grind a weapon for you, maybe do it all via a broker who charges a mote or coin to do the transaction). Same goes for purple upgrade materials, that's where the true exploiters would start to come in. Blues and greens, whatever. Doesn't effect gameplay. Cheers!