I think you've hit a bit of a logical mistake here. The study doesn't show that members of rich and powerful fraternities get higher incomes. It shows that the

I think you've hit a bit of a logical mistake here. The study doesn't show that members of rich and powerful fraternities get higher incomes. It shows that the average fraternity member gets a higher salary. This is moderately surprising to me. Instead of the rich, it is surprising that any grouping of people might raise salary expectations. Keep in mind there are plenty of fraternities who don't even have a fraternity house and I'm assuming they are included in the average.