USD scams were hell to deal with when I was Market Squad.
So many ways users can get fucked and there is no way we can prevent this from happening, unless we make our own version of a money transfer site (lol), that we have direct and very supervised control over (TSA, most likely).
Then the next issue is the forgery of "proof" of transaction, it's such a hellish thing to deal with.
I say in order to prevent scam reports for USD, have people put their name on a list (and you can only put your name) so if you agree to the terms of USD dueling, etc. that if you are scammed of USD, Market Squad can not and will not reimburse you.
My idea, at least.