Scenario - player A has a warlock. Player A has been grinding for since launch for a heart of praxic fire. Player A bought a head piece engram from xur. Saint 14 helm acquired.
Player B sacrificed several goats to RNGESUS for a saint 14 helm with no end However, he does have a praxic fire stored in his vault.
If you're worried people will give out exotics for free on reddit and ebay then a very strict system can be implemented.
150 vanguard or crucible along with a token purchased from the speaker for 10 motes of light. That way scrubs will have to grind endlessly for trading moreover, with the new material and vanguard exchange vanguard marks are pretty scarce so a compromise should be made.
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Even a strict trading system is vulnerable to exploit, specially when you involve being able to disconnect from the server instantly so easily
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That was a one time thing. I doubt crashing of servers will have anything to do with trading.
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Not crashing, disrupting. For example: kneeling Crota
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Just like I said, its most probably a one time thing.