"If the price is right, I go for the competition," Rickson Gracie
So.... you will do it for the competition (very noble) BUT only if the price is right...
It's a fact that Sak will fight anyone pretty much anywhere. His record has shown this time after time. Gracie however is probably scared to risk his reputation/legend/myth with a fighter who has dominated his style time and again.
I doubt you will see Rickson fight Sak regardless of the money. He should quit trying to live off his blown up rep and just retire with grace. He would probably have more respect if he were to do that instead of trying to perpetuate his greatness with fights that will not happen.