I manage people who make up to 50% more than I do.
Your employer pays you what you are willing to take, or you leave and they hire your replacement. If they can find no replacements, they raise their wages. If they need better replacement, they raise their wags.
If they are making money and they are paying the minimum of what they need to to get the type of employee they want, they are not going to voluntarily pay more. Get your heads out of the sand. The UFC is doing exactly what every other business does, and seemingly pretty well.