Earlier quoted context omitted.
You don't get to enter your initials into the machine based on how far you get. Only your score matters, and your score resets when you continue. You don't "beat" Pac-Man when you get to the kill screen, you beat Pac-Man when you get a perfect score.
High score resets whenever the machine is unplugged. Score isn't the only measure of success in Pac-man or other arcade games.
score very much is the measure of success in pacman and its contempiraries. what else is there?