The percent of homeschooled children is higher for college-educated parents and for high income families, and it grows faster compared to different population segments. Data from this article http://www.usatoday.com/news/education/2009-05-28-homeschooling_N.htm
"Home schooling has grown most sharply for higher-income families. In 1999, 63.6% of home-schooling families earned less than $50,000. Now 60.0% earn more than $50,000.
6.8% of college-educated parents home-school, up from 4.9% in 1999."
Another way to read the first factoid is that homeschoolers grow rich in time. This is probably a stretch, though ;-)