You're forgetting that UFC fighters are not "employees" they are independent contractors, meaning they foot ALL of the taxes on their end. Since they are not employees, they also have to seek health insurance independently.
Figure monthly how much a fighter pays to train at a gym. Then figure how much they pay to dedicate a team to their fight camp. Then figure bringing in sparring partners from outside if they are at the elite level. The UFC only covers the flight for one coach for an event, so the fighter is paying if he wants anyone else to come.
Fighters also need a lot more maintenance. Factor in physical therapy, sports massage, diet/nutrition(ist).
Then remember that the UFC is the highest level of the sport, and the athletes are the very best MMA fighters in the world.
Then remember that most fighters have less than a 10 year window to make money for the rest of their lives.
Then factor in long term damage from an MMA career.
Then consider 90k here in LA is considered low income.
60k gross income still sound good?