I was talking to a very wealthy man about this recently. I asked him what his essential financial wisdom is. He lives in a home probably $10M in value.
His main thing is keeping his cash highly mobile. He prefers the ability to call his guy and move X million $ from place to place in five minutes. Real estate, at least for him, is too static.
He mentioned that he and his wife were still living in the same home for 35+ years. They live very close to Trump National Golf Club in New Jersey, and I suspect most people who see it would be surprised that someone so wealthy lives in such a (relatively) modest home.