Remember Mitt Romney and his seven houses (he didn’t even remember how many he owned). Obviously, he could stay at only one at a time, but you cannot just abandon a house, so he has to keep at least a small staff at each one. I assume he owns a yacht, which doesn’t come cheap and requires a crew. If he doesn’t own a jet (with all its crew) he probably charters one whenever he travels. I tried to imagine what all this costs and came up with a minimum of several million a year. I counted 1% of its cost per month for the rental value of owning a house.
On the other hand, I have a friend who is quite wealthy (not Romney class, but his net worth was about $100 million before he was an early investor in google) and he lives relatively modestly. He has a nice house, but only one, three Mercedes in the garage, a swimming pool, but on a lot that is well under an acre. His living room is large enough to contain four pianos and the largest projection TV I have ever seen. But he mostly eats at home (although he always picks up the check when he eats out) and, when I visited, his lunch consisted of a $4 bowl of soup from the canteen in the basement of the math dept.