This comes from ConsumerismCommentary.com about Steve Jobs:
Despite some fancy homes that often went unused and a moderately flashy car, Jobs seems to have taken the ideology of The Millionaire Next Door to heart. He continued to live his life mostly as he always had, not flaunting his wealth and not drawing too much attention to himself outside of his job responsibilities. For someone whose motto and company marketing slogan was “Think different,” Jobs appeared to desire to keep his differences unseen.
The Millionaire Next Door changed the way people think about millionaires. Most millionaires worked hard building a company to earn money. They didn’t earn it. They tend to blend in with their surroundings, not flaunt their wealth. Those who buy items as status symbols tend not to be wealthy (purchasing items on credit) or are wealthy only temporarily due to overspending. This idea of an understated millionaire, comfortable with his wealth and free of a need to prove himself, seems to fit the profile of Steve Jobs.
It’s perhaps an approach that would befit anyone who found himself with any amount of wealth beyond what is needed to afford the necessities of life.