This may be useful...
Income "floors" for various percentiles (from 2000 figures):
Top 1 percent: 313,469
Top 5 percent: 128,336
Top 10 percent: 92,144
Top 25 percent: 55,225
Top 50 percent: 27,682
Maybe we can work out some idea of "rich" from this. $500,000 seems a bit high...
