Someone preserve this so that when TSHTF, Paris 1793 style, we can see what conditions led to it.
That's because $100 million is really a 'tweener number: You can be Richie Rich among your upper-middle-class friends or a hanger-on in the superrich crowd.
Ok, this is stupid on so many levels. First among them is that the difference between upper-middle-class and upper class is not, in reality, based on an income threshold. Steve Jobs was a billionaire and solidly middle-class. He worked too hard. Bill Gates is possibly lower-upper but he had to push himself into the right circles to get there.
The upper class (the real one) is a well-connected, socially closed set of parasitic people who peddle social connections and influence as a means of sustaining their insanely expensive lifestyles. They generally have the resources to accrue $1-2 million per year without really working, just by selling and exploiting their social connections, but they aren't all in the $50m+ net worth crowd. Just like us, some of them negative net worth. In their cases, it's usually a consequence of doing seriously stupid shit.
You can separate the lower class from the middle class based on education, income, and job prestige because the middle class's values are defined based on an ethic of production and these are taken as evidence of a productive life. The middle-class line corresponds to an income around $100,000 per year per adult at age 40, adjusted for cost of living and job prestige. (Yes, this means that 50th-percentile is not "middle class"; society is pyramidal.) The upper class, by contrast, defines itself based on an ethic of consumption-- materially speaking and in terms of social access (the ability to consume the attention of important people). Different things entirely.