I think they have a fundamentally different personality type: sportsman vs. gamesman. Sportsmanship values honor and conduct; gamesmanship values winning.
It seems that the highest levels of competition reward gamesmanship over sportsmanship, perhaps unsurprisingly. There is a culture of gamesmanship, and gamesmen have better outcomes. Competitions where this seems to be the case include:
* auto racing
* football (world)
* football (american)
* cycling
* fighting (MMA, boxing)
And I'm sure plenty of others. These mottos are prevalent: * If you're not cheating, you're not trying
* It's not cheating if you don't get caught