Storage exchange system

After win alot repeated weapons. And also play another online games. I think should a good a idea to implement a trade system in this game.
For example: I win 3 M4-XS-Legend Dragon and another guy win 2 M66-Legend Dragon. So i tell him to trade a M4 for his M66. I can made with a special server to make the trade or can be in a room.


Now they will say that they will not do it because it can reduce the sales of zp and blah blah blah...the idea is make a little more worthy spend zp in this game. Also crossfire have a lot of items and weapons like another games have a lot of skin. The game have potencial to have a own "internal economy".