It would be SO broken I remember when 360 gave Dead Island free and it doesn't really have a trading system but Its basically the same Dead island: I was low level some super high leveled guy gives me machine gun with infinite ammo and exploding bullets,totally ruined the game for me made everything too easy, no reason to craft new things etc... Destiny:Some guy with a lot of exotics(which you have to admit ,they arent really hard to get) Gives you everything and instantly gets you to 30 as long as you are level 20 ( which isnt really hard to get to either) which completely ruins the game for this player too. Maybe It wont be AS bad now ,but in a few months it will be totally broken because by that time a lot of people will have the same exotics.