Theoretically could you hack the kegbot by adding a flow meter and solenoid valve so that certain accounts could only pull so much beer out of the tap and when that amount was reached the solenoid would close and nothing would come out of the tap until a another credit was inserted? What I'm asking, putting aside all legality issues at the moment, could you make a robotic bartending kegerator where you would either insert money or swipe a card, pull the tap handle and it would dispense a pint?