I don't know what you're going on about. Where did you come up with all of these figures?
600 dollars would've equated to 2400 plays. Assuming an average of 90 seconds per play, the game would've been occupied for 3600 minutes. And each week has over 10,000 minutes.
Doesn't seem outlandish to think that a Pac-Man cabinet in a popular location could've done such numbers back in 1981 and been busy 1/3 of each day. It certainly isn't physically impossible.