What's up with Judah's crazy low paycheck?

He was 1 fracture away from a 5 digit pay check. 5 DIGITS! In a big ass fight, he should find it an insult to even get payed that low. Of course he knows that now he'll be payed a lot more with big fights coming up in the future though is it even legal for them to have paid him so low? Did Showtime just rip him off or what? They made all that money off the PPV sellings+the sell out crowd, and was able to keep the majority since Judah got paid peanuts. Even Manny got paid 400,000 when he fought Ledwaba wayyyyy back and that was his first fight in America. I just don't understand it.