If it doesn't simulate or prepare you for combat then perhaps calling it a combat sport is misleading. The Gladiators of Rome practiced combat sports, people who practice arts with rules and who quit to avoid injury are not learning about combat, they're learning sports entertainment. People who go to Dojos are usually learning cultural dances, neither prepares you for something like this because trying to use a technique from either will land you in the morgue.
http://uk.youtube.com/watch?v=ibGyGG3X4PI