This is true. I used to do it for runescape. Think about it. I have a gally and need a icebreaker and my friend has one. By completeing nightfall i have gotten 4 additional gallys and he has gotten 7 icebreakers. Through the trading system i can do no work and get an exotic. With the trading system exotics will be come worthless and there is no need to grind and play the game.