Xbox Live Policy and Enforcement dude Stephen Toulouse has said that not only will cheaters' total gamerscore be reset to zero, their gamercards will also be branded - so the fact that you've cheated will follow you around forever.
"The bar is a little bit higher than that," Toulouse replied when Major Nelson quizzed him about gamerscore reset on latest podcast.
"The other thing it does is, it puts a tag that you've been cheating on your gamercard. That's a pretty big Scarlett Letter."
So don't do it, innit!
Full podcast through the link.