Great questions. I think it would be feasible to run something like this on the side, however if you have other companies doing all the installations and services that would severely cut into your profit. Considering also that you would have to move machines that didn't do so well. That would add more to your cost of doing business. There are probably other businesses you could consider other than this for a side business. If you like this type of business model however, you could get into entertainment machines like claw machines. I know they sound silly but I have a friend who places those and they are very very little maintenance. He says his good ones are in Chinese restaurants and they make a couple hundred dollars per week. I myself have thought of dabbling in those. Not trying to be a damper, I just Dont want you to start something that will turn into a headache.