60/40 if you can. Depends on how many patrons use the venue per week? Percentage of new customers to regular ones. You would want to be earning at least $30 per week to not only cover its power consumption but the wear and tear of the machine being on for long periods of time (DMD, connectors etc).

Operating pins for the most part is a flop, especially when they are by themselves. If you are purchasing a machine for the sole purpose of earning it's initial cost back, sorry but most likely won't happen.