Got a question on how this works. It is a prepaid amount that will go towards any purchases at a bar, correct? Now say you have $1 left on the 'card' and you buy a $10 drink what will it do after that? The rest go to your sail and sign, or what? I've got a group going and they are thinking that this might keep them from spending to much at the bar by having a preset amount that can be spent and then it will tell them 'your out of bar money' type of deal. I am thinking it's just applying an amount towards your bar bill at the beginning so it's not such a big bill at the end. Anyone with experience/knowledge on how this works?