Money has a sort of Maslovian pyramid: Survival, Leisure, Comfort, Status, then Power. Most middle-class Americans are in the second level (Leisure) while the Koch brothers' ambitions exemplify the fifth (Power). Most upper-class people are in the fourth (Status). A lot of people think they'll "get off" at the Comfort level, but few people do.
The Survival level is met when one's basic needs are met. This doesn't mean the risk of insulting inconveniences (such as having to move under adverse conditions) go away, but one isn't at risk of starvation or homelessness once it is achieved. Leisure is the level of most middle-class people: buying TVs, going on longer and nicer vacations. Comfort is having cleaning services and getting to fly business or first class when traveling: essentially having a life with as few annoyances as possible.
Most normal, man-on-the-street types will admit they want to be rich enough to max out the Comfort level, while frowning upon those who care about Status and Power. The problem is that one doesn't max out the Comfort level until over $500,000 per year. Most people think they'd be happy to "get off" at that point, but it's really hard to keep that kind of income, steadily, unless either (1) you have $30 million net worth or so, and most people at that point feel like they're entitled to more than a lower-upper-income lifestyle, or (2) more commonly, you get some sort of job paying that much income. You simply don't get the latter unless you convince people that you're "special". This is what draws rich people into the idiotic status obsessions-- the need to socially climb in order to continually prove themselves to be worth those kinds of salaries and favors-- and that game is pretty much never-ending. It's gambling: spending money in ways that seem ludicrous on high-end art, real estate, club memberships, and alcoholic beverages simply because they are exclusive and expensive in the hope of improving one's social status and, therefore, future income. As with any gamble, some people lose everything. Rich people are no exception.