What jobs do big house owners have?

I keep seeing YouTube videos of pet owners who live in mansion sized houses containing 3-8+ pets and a large backyard and swimming pool and regular trips to the beach. What do these people do for a living? I see so many rich people in my zoom meetings too but I used to think that high paying jobs were limited and only surgeons and investors had that type of money.
What jobs do big house owners have?
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