I find it difficult to understand what motivates some of these uber-rich people to keep going. There comes a point where they have more money than they grandkids kids, kids, children will ever spend. Why not just say "fuck it, I'm still young-ish, I'm rich as fuck and I'm going to go chill and enjoy the rest of my life"...but so often they don't. I guess that's why they're as successful as they are. That insatiable drive.