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Warren Buffett is constantly listed as one of the world’s richest people, with an estimated net worth of more than $100 billion. But unlike his good pal Bill Gates, Buffett doesn’t live in a sprawling $100 million lakeside home. No, the 91-year-old chairman and CEO of Berkshire Hathaway doesn’t exactly live like a Kardashian — although he could afford to do so. Instead, it is quite the opposite…