Why aren't debit card transactions handled separately and differently from credit card transactions? Since they come from a guaranteed fund source, I would think they would make possible a special "no chargebacks permitted" transaction type? I see no way to get people to stop doing chargebacks after they've come down off their sexual arousal inhibition lowering short of widespread social education of a sort nearly guaranteed not to happen, so it'll have to be some solution that simply makes it so people CAN'T unspend the money.