Well, by that logic, it should always have been this way. And yet, conspicuous consumption by the children of the ruling class, is not an historically unusual event. Pretending you're poor when you're very rich, while perhaps not unprecedented, is at least not the norm. So I think an explanation is called for, and hers is at the very least quite plausible.
Whatever the reason, it would have to be something that is not common to all times and places, because the college-age children of the ruling class don't always act this way. One wonders if, for example, the equivalent demographic in China (a rising power) acts this way.