That is: how much does your .0001 estimate of SIAI's chance of preventing a humanity-destroying AI go up or down based on an N$ change in its annual revenue?

I feel that this deserves a direct answer. I think it is not just about money. The question would be, what would they do with it, would they actually hire experts? I will assume the best-case scenario here.

If the SIAI would be able to obtain a billion dollars I'd estimate the chance of the SIAI to prevent a FOOMing uFAI 10%.