Whereas the "high income" people -- typically doctors and lawyers -- are spending lots of money on nice suits and cars and homes, but have little to show for it in terms of actual wealth.
Having said that, I don't mind the rich who aren't pretentious getting a discount. I'd call it a "pretention tax". What's further ironic is that the former tend to appreciate paying a little extra if it ensures that a job is well-done, whereas the latter tend to skimp on paying extra, and often get the poor-quality results you'd expect.
And yes, there's exceptions to both categories, too -- indeed, it's not as if it's hard to live within your means as a doctor or a lawyer, if you don't mind looking a little "lower class" as a result (and if your clientele are the working class, this may even be a bonus!). But it's nonetheless a fascinating dynamic to keep in mind!