When a CEO is making 50M-100M a year, what do you think drives them to work for decades? When one year's salary is enough to live on for the rest of their lives?
This guy doesn't sound like "he needed the money". Sure, you can never get enough, but there's more to it than that.
I gave that some thought - how long has he been retired? Few years? It only took me one year to get burned out on golf, or maybe he is burned out on his Wifey? Some people say they enjoyed marriage until they were retired. lol