But look at that statistic. What is the proportion of people who are millionaires compared to the general population of people with higher education versus people without post secondary education. What percentage of people with a post graduate degree will make a certain income versus the percentage without a degree?
For example.. let's say 100 million americans don't have a college degree. 10 million have a post graduate degree, either masters or doctorate.
Out of 1 million people who have an income of 500,000+ per year, 50% have graduate degrees, 50% don't. The odds of being included on that list are MUCH higher if you have a degree, versus if you don't.
Rambling, but see what I'm saying?

Statistics can be misleading. (I should know, I'm a stats major, LOL)