For one of the world's richest people, Bill Gates is famously unflashy about everyday things. He has long worn inexpensive Casio watches — once cheerfully noting a roughly $10 model — even as he paid more than $30 million for a Leonardo da Vinci notebook. Gates has also said he still washes the dishes himself most nights at home. The contrast — a $10 watch and a Codex, dish duty and a Gulfstream — became a favorite illustration of his idiosyncratic relationship with money.