Sometimes coin counters are like the odometer on a really old car. You are never quite sure about how many times they have rolled over. I have one game with 700 on it (My Artic Mini mame), one with 121,000 (Turbo), while my Kangaroo and Jack the Giantkillers are both in the 20,000s, and I think my Assault has 40K on it. Had an import skill slot once with 8 million on the coin counters and my dart machine has 10K on it. Not sure about my pinball, since it only has a software counter that can be reset, but it shows 2700 games, of which 700 were put on by me.
I don't think any of my games have rolled their coin counters, but I wouldn't trust the reading on a Ms. Pac or a Galaga.