Just put a X Men Pro in and be done with it.....kids n adults will put alot more $$money into that then the title u currently have.
It is very likely people will make the effort to come to your shop just to play the pinny, then spend money whilst they are there, versus only coming there for food, and playing the much much older machine whilst they wait.
At least with a modern game like X Men Pro, everyone can relate to it and almost the vast majority of people will know the theme.
Less upkeep, easier to finance, and tax deductions n depreciation all easy to come by, and a keeper of a pin after the shop has paid it off with the coin it will bring in.
AMD were doing the X Men Pros for $5950 (instead of $6200) and I think they only have one left.