But what if everyone makes 3 millions? You still make the same money as the example above, but it doesn't get you the same lifestyle, not even close...
So it's not only important for the super-wealthy to keep accruing their income and assets, it is equally important for the rest of us, peasants, not to be able to catch up with them.
Yeah, I know, it's very basic, but it helps explaining some things, such as why middle class stagnation is not necessarily deplored by everyone...
As Dogbert says in a Dilbert comic strip (go ahead, call me a nerd :), "There's one thing about us, rich people: we don't like company." Europeans think a hundred miles is a long way. Americans think a hundred years is a long time.