Chuck, Sylvia, AA, Tito... they should all be getting a million per fight, regardless.
They do. The main event guys get PPV chunks but it's never disclosed. The only one I've ever seen give information on is for Liddell Couture 3 where it was stated that after the PPV bonus Zuffa gave Randy and Liddell both fighters did "well over a million dollars" for those fights. I don't have the link offhand but it was in an older post about salaries.
Look at Chuck's all access... it would have cost him 2 fights to get that Ferrari and probably 6 years of fights for that house if all he ever made is the salary.
And for the little guys, they have a shot at 10k for the Tapout KO or Submission of the night.