(sorry to pull from another thread, but I think this is interesting)
A dev at Riot (August, on his stream) was talking about a time they did an experiment on this, where if you were banned for cheating, you could send in an apology note promising to never do it again, and they’d let you have your account back.
What they found was that 91% of the people who got their account back that way, were banned again for cheating again within 6 months.