I've had someone attempt to defraud me before, with clear evidence, and Ebay automatically took their side. All I did was point out to Ebay that by supporting the fraudster and thus being complicit in fraud, I was going to make a complaint to not only police but to the relevant governing body (ACCC, ombudsman or something, I can't quite remember). They pretty quickly gave my money back. I was still really peed off that the ahole actually got away with it but I had my money back so I moved on.