In a world where 20% of women make more than men, and 30% make the same amount, your calculations do not compute. Also, research indicates that hypergamy is a dynamic that has been persistently on the decline for decades. Invoking it doesn't actually ring true.

"A relentless focus on “mating value,” narrowly conceived, also contrasts with an analysis of several data sets reporting what characteristics men and women find more and less important in a partner. These show that for the past seventy-five years, across a number of different countries, the most important attributes in a long-term partner for both women and men have nothing to do with youthful fertility traded for resources."

Fine, Cordelia. Testosterone Rex: Myths of Sex, Science, and Society (p. 75). W. W. Norton & Company. Kindle Edition.