I don't even understand the debate: Your lifespan, healthspan, lifetime happiness and ability to run a company will only go up once you cash out for 4-10 million or more. You've literally solved the money problem at that point. Why would you risk that on a vanity billion dollar exit?
Also, to rip off Sean Parker's character in "The Social Network", do you want to end up like Roy Raymond, who committed suicide after selling Victoria's Secret on the cheap, watching with regret as it grew into the billions?