I mean, I agree, I'm not going to be losing any sleep worrying about the unsatisfied billionaires. But what he's saying is that given the cost (losing 30 years of his life) the 'reward' ($35 billion) wasn't enough. He's not saying he doesn't like or want the money, he's saying its not enough to give up your life for.

If anything, it would explain why rich people keep pursuing money long after any sane person would be content with their millions/billions. Maybe if you just get given a few million you could be satisfied with it, but if you've had to sacrifice your life, friends, morality and so on to get it... And you realise it doesn't actually make you happy, so you keep chasing more, hoping that eventually enough will be enough. Better that than realising you're an idiot who fell for capitalism's big lie and gave up the stuff that actually mattered in life to get more numbers on a sheet.