In the past Trading gear/weapons leads to $$ involved and people hack items to sell for $$. And these people will bring these weapons or gear to fight Novel Guardians.. it's a sad thing but it's always an issue.
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thats why my first suggestion works so well "Maybe have it where you can only trade items with someone who was in your fireteam when the item was dropped and only for a limited time" you cant exactly sell those for money now can you if the person has to be there in the fireteam to get a chance at the item.