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For example, some players want to trade accounts. Instead of getting an email with a nub account, you can see what hours they have, kills and the other stuff before trading. And you don't need to trade emails, you can just trade the player without giving an email.
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Beside that, most games with trading are liable to more issues due to abuse of the trade system. Especially when someone is trying to scam a younger audience. "Oh yea, I gtg soon so trade me that mount and i'll give you my hats later." Really, it opens up more potential scamming outside of account-trading.