At What Point Does Someone Become Rich?

[Bryan Hancock]

We have a progressive tax system in this country that supposedly taxes the "rich" more than common folks. I was wondering at what point someone magically becomes rich and should shoulder the burden of carrying others via this tax system.

Let's try to keep politics and ranting and raving out of the discussion as much as possible and simply focus on when this threshold is crossed. What is the new litmus test for "richness"?