We can't. I'm sure it's been addressed, but Bungie doesn't want people being like here's my paypal I'll trade you Gjallahorn for an ether seed Also, Bungie wanted a teen rating to sell more copies. Hence why there isn't an in depth complicated story like there was supposed to be because younger people wouldn't be able to comprehend it, not because they're not smart, but because their brains are still developing. So, with that being said, a 24 year old trading with a 10 year old would get the upper hand every time, hence why games with more in depth story telling & trading can have a higher rating. I think in the long run it may back fire. They may sell a lot of copies of Destiny 1. But, because of the lack of story, no trading & not delivering what was expected may keep some younger people in the game, but I think a lot of the older players may move onto other games as there are more video games to choose from...I will most likely come back to Destiny personally...but you never know what will happen