My dad lived with a guy in college. They were in Hawaii and this guy was a boxer. He paid his rent by finding karate hotshots at bars and sharking them. They could do any goddamn roundhouse crane kick bullshit they wanted and he'd even put on the gloves. And if he didn't have them ten-count-out in five minutes, he'd give them double their money.
he paid his rent this way.
Boxing is, at base level, an endurance competition. Successful boxers are the ones that can give and take more violence over a prolonged period than their competitors. MMA is over too quickly for it to be about anything other than stylized violence... which is why every ten-fifteen years we need to have the hot shit in not-boxing get annihilated by whatever boxer will do it for the least money.