Getty Images / Bill PuglianoWarren Buffett is the billionaire boss of one of America's biggest companies.Yet Berkshire Hathaway's website looks like it was built in the 1990s and hasn't been updated since.The antiquated website reflects Buffett's values of simplicity, efficiency, and frugality.Warren Buffett is one of the world's wealthiest people with a net worth of $144 billion, and his Berkshire Hathaway conglomerate is worth about $1 trillion.