Most of my games were crumpled ashtrays of a game when they came in the door.
When I restore them, they get torn down, rebuilt, fixed, etc.
They should be as good as, perhaps better than new.
Parts fail, that's a given. New parts fail, old parts fail.
So, parts could fail - but I'm confident that I could fix them again. And I'm certain they get less abuse in my home than they did on route.
So, I don't worry. If something breaks, I get to enjoy fixing it.
If my guests can't play a particular game for a day or two, they can either play another game, or enjoy my company