I do understand you. Personally I would answer similiar as you did. And about scamming, I'm selling some stuff too, so I'm tried to be scammed quite often myself and I know how it is and how often.
This particular case was with American Express card and I assume it works just like with all others bank cards. You make a purchase, they put it in pending balance, then after week they refund it or process it. Mine was processed. I did actually wait for confirmation before writing. I have it in my bank statement. I lost $xx us. Sorry for telling the truth and explaining my bad experience, but it's what happened to me. Money don't grow in trees, you have to work hard for it. Let's assume I got to bank, it will take me 2hours. I have 50% chance of getting that money back, so in order for this trip to be profitable for me, it needs to be $xx lost > 2x hourly wage rate * 0.5 . At the same time, Paypal payment was processed perfectly and you proxies are good, have no complaints about them.