People like you are the reason we need the rule of law. I am not defending the scammers, but vigilantes are insidious. You may claim you were being ironic, but a mob with its passion inflamed by a sense of righteousness has no time for subtlety. Please tone it down before innocent people get hurt.
I hope that whomever just scammed you out of ten euros gets swift, repeated hits to the knees by baseball bats.