I am studying to become a nurse. I'm sure if you asked a fighter a theoretical question "do you think nurses should make more money?" a lot of them would say yes. That doesn't mean they are going to make it a priority in their lives. Similarly, I can say that I think fighters should make more money without actually making it a personal goal of mine to make it happen. It's just a discussion.
The reason why it should happen is because fighters deserve a bigger piece of the pie when it comes to profits because they make the product possible and the occupation requires a great deal of time, dedication, skill, and physical sacrifice.
We'd get a better product if fighters got paid more because it would attract more athletes. So there is legitimate reason for fans to care if you want to go with the selfish angle.