Haha! I assume you're next to last line means your trolling. No sport/business wants to pay money to people that don't deserve it. There are weight classes because people are willing to pay to watch.
But to follow your "logic" a step further, there shouldn't be any species class either. Leopards running the sprints, horses 1500 and up, whichever animal you consider the deadliest, bear, lion, etc., in the combat sports.