Both the Diaz brothers have been fighting forever. Nick has been pro for 17 years with 35 fights. Nate 14 years and 30 pro fights.
To put that in context, the current WW champ only has 22 pro fights and he's older than both of them.
Both of them are a draw. Put them in a main event against anyone relevant and you get solid PPV buys.
They have paid their dues with plenty of bloodbaths. At this point they want big paydays. And frankly I don't blame them.
As a fan, I'd like to see them fight again but as a fan of the sport I understand that they have value and expect to get paid accordingly. Why get punched in the face for pennies?