The answer is very simple. Imagine a WWE wrestler getting a shot fighting a top 10 guy in boxing and putting up a decent performance. then imagine that same fake wrestler winning 4 in a row beating 2 former champions in boxing while winning the undisputed title and defending against a guy who had literally ko'd everyone in the first round. then imagine another fake wwe wrestler coming in and getting a fight in the main card of a boxing match PPV. seems crazy right? Laughable even. Well, it happened. In MMA. That's why.