Bungie,
If you introduced player trading, you would make many gamers a lot happier due to the fact that this game is based on luck and some people just aren't that lucky. People who have finished the game would have a new reason to play because now they can get stuff that they couldn't manage to before, therefore more playing time on destiny and then more recommendations to destiny which eventually leads to more money. All in all, I think it is pretty clear what you should do
Thanks
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Be-warned the "Special snowflakes" are coming to preserve their special snowflake status. They built their self-confidence around the exotic drops they got being a sign of skill despite it being luck so when anyone suggests they make it easier to get any of their exotics they have a temper tantrum because you threatened their special snowflake status. Another case of the vocal minority suppressing the silent majority.