There isn't a need for a trading system as everyone gets their own personal loot. There isn't anything really to trade. Bungie has already said they want you to have a memory associated with that item you get. "Where'd you get that awesome looking gun?!" "I went and killed this wizard on the moon it was an epic fight we almost didn't kill him!" "Cool! Want to go again?" Or "Where'd you get that awesome looking gun?!" "Brought it off dave" "Oh" The problem now a days is gamers ARE lazy. They hate change and always try and make a game like something else they've played and if it doesn't have it then it's "shit" (apparently). Then if it's added it isn't good enough and aren't happy till they've ruined the game with all their moaning!