I bet when trading was avaible then people will find ways to dupe ;)
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Not if you just make it so you can only trade items of equal rarity.
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Still easy to dupe then, even materials will be duped and players will exchange it for reputation or marks or they will dupe glimmer if that was tradeble....... Or weapons can be dismantled so that would be an easy way to get a ton of materials without losing the weapon