[quote=@ImportantNobody]
<Snipped quote by MelonHead>

That would make your score infinity, which sounds more broken. Or someone can pla one match, win, and quit with the high score.
[/quote]

That would be a quotient, not a difference. Melon's score would be 7 - 0, or 7. Somebody who wins once and quits would have a score of 1. somebody who goes 5-2 would have a score of 3. It's not a bad system.