i think exotics and legendaries are going to be bound to account

Where did they say they were going to put trading in? Bungie have always said trading would not be a part of the game.

Where did you find this? Post a link.

Engram wrote

-Excite- wrote Where did you find this? Post a link.

Were really excited about creating a player economy, Tyson Green, lead player investment designer at Bungie, told IGN. This is going to be a game that the community really drives, but for launch were going to be restricting it to trading items between your own characters.

Bungie is still learning how Destinys economy works, in addition to the security situation for both our systems and all platforms.
Player-to-player trading will open up as soon as Bungie is able to enable it, but until then youll only be able to trade items between your own characters.

Pretty sure that was posted on IGN, which isn't too good of a source since Bungie never said that, I don't think.

Engram wrote

-Excite- wrote Where did you find this? Post a link.

Were really excited about creating a player economy, Tyson Green, lead player investment designer at Bungie, told IGN. This is going to be a game that the community really drives, but for launch were going to be restricting it to trading items between your own characters.

Bungie is still learning how Destinys economy works, in addition to the security situation for both our systems and all platforms.
Player-to-player trading will open up as soon as Bungie is able to enable it, but until then youll only be able to trade items between your own characters.

Unless Bungie releases an official statement about trading in Destiny, we will never know for sure. With that being said, I think that this would be an amazing idea.