I don't know Duvall's finances, but I guess that he was pretty well heeled by then. Why wouldn't he think more about being part of an American epic and put his money concerns aside?
I hear ya... but GF3 was ALL ABOUT MONEY, no? So why would he take that angle?
"What I want.... whats most important to me... is that I have a guarantee" - Train approaches.... Bang! Bang! Bang!