Yeah luckie, I wasn't trying to argue with your idea, just bringing up some potential snags.
I remember a little while after I started playing I was in a game with 3 multi accounts. I had never really visited the cheating and abuse board before that, but I reported them and they were eventually busted. Then I couldn't figure out why the game was still going because I thought it would have been cancelled. I thought perhaps lack might even go back and manually delete the game record.
Looking back I see how impractical my thoughts were at the time, I was just quite mad at being taken advantage of (even though I think I may have won the game

) I think the only way this suggestion would work is if it was an automated process- ie as soon as a multi is punished that game is suspended and no points are gained or lost. Another problem might be terminator games, I'm not exactly sure how those points could work. But let's say this was implemented and your game was cancelled (you, an innocent party) then you'd log into my games and under recently finished or perhas a different category the game would be sitting with a title "cancelled because of cheating reports" or something to that effect.
It still wouldn't do anything retroactively to change the points multis may have already gained in previous games, but I think it would be a step in the right direction because the current set up isn't entirely fair.
And perhaps if someone was later cleared because of an appeal the game could resume again to minimize the negative effects on the wrongly accused.
Hmmm....