It's not like he has to live paycheck to paycheck now that he built it. Rich guy builds expensive thing because he can.
Nope. But I heard Costco has quite a selection of 1-15 years survival kits if you are. I also heard they have been selling like cupcakes since the Obama years.
If you're infinitely rich it's pretty stupid to not have a doomsday plan. We are due for a big ass financial calamity but that's kid stuff compared to what would happen versus a tangible disaster like nuclear war, solar flare, rogue asteroid, deadly plague, alien invasion, super volcano, etc.