The number of confounding factors is enormous.

1. The man may be more likely to acquiesce to the wedding if they have a stable income and can support a family.

2. The interested parties on the bride's side may be more interested in pursuing a shotgun wedding if the man has a stable income.

3. The same reasons that lead women to pursue marriage with high-income men may also lead them to pursue pre-marital unprotected sex with those men.

I'm sure you can think of more. This seems like a very suspect way to segment a population.