I have 15-20 games at locations at any time (out of 24). The biggest is a bowling alley, where we also hold tournaments. The annual three day competition has 20+ games (some from the community as well). Regular tournaments have my 10-15 games that are located there at the time, available for the event.
They are all fully functional, level, and playable. If at any point they are not, they are fixed or turned off (or even removed) until they are fixed. Simple as that, it is a matter of pride, and important for Pinball; to ensure new players enjoy their pinball experience, so that they might play again.
Our Tournaments always begin with Only fully working machines included.
Some operators certainly run with more sense of pride than others... I go to the city and am horrified at some of the neglected sited machines I find.
Admittedly, something that probably helps me pull this off is the fact that pinball is not my primary income source... more of a passion (or charity Lol).