It’s a mad mad mad men world

Quick, to the ObviousMobile:

Men who grow up thinking women should stay at home may be labelled "old-fashioned" - but could end up well ahead in the salary stakes. A US study, published in the Journal of Applied Psychology, suggests that they will consistently out-earn more "modern-thinking" men. On average, this meant an extra $8,500 (£4,722) a year.

I take it that this result surprises absolutely nobody. My question: Is the discovery that men with old-fashioned values out earn "modern" men something close to a sociological tautology?