Who decides what's "fair"? Shouldn't the market decide? Otherwise, of course people will always be incentivized to argue that their subjective opinion is what's fair, and that's almost always going to be, "I should have been given more."
Everyone who makes a billion dollars must attribute that success to themselves, but also the people who built the roads their product is delivered with, the teachers that taught them in school, the doctors that keep them healthy, etc.
What fraction of the wealth earned by a billionaire society is entitled to for its contribution will always be a fair policy debate.
That said the market is a terrible judge of fairness since it's a feedback loop so luck early on can definitely allow you to extract an unfair amount of value later(this is what Wilkinsons employee was saying basically, Andrew pointed out that they offered them share packages instead of salaries and the employee replied that his employees couldn't afford to live without a salary like he could so it was never a real option so they didn't actually have a chance to capture a fair amount of the value from their work).
(It's been a while since I read the book I could be getting some of the details slightly wrong)