It's probably not worth the time and effort in regards to how much money you could make. If you have a route with 100 machines, maybe... But, placing a few machines in a bowling alley won't get you anywhere financially. And then you'll need tax permits for the machines, liability insurance, repair calls, business taxes, etc... Also, I would never consider doing this unless it was under a LLC... Enjoy your pinball machines at home and let someone else handle all those pinball route headaches...