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Honestly, common sense needs to prevail here.
Scams will happen, problems will arise if you do direct trades. There's just no protection, it's far too easy to get conned.
Don't do TRADES, always always use something like Paypal to buy stuff, that way you have protection if something goes wrong.
Sadly, as it stands, the system in place here is massively open to abuse and will continue to do so as long as there's people who insist upon taking such risks.