Women across all income demographics desire men who make as much or more than them. It's a fundamental preference that OKCupid identified a long time ago.
As a man, I don't fault this. The risk to a man of reproducing with a woman who isn't great at making money isn't as high, at a fundamental level, as it is for women. A man isn't incapacitated in any way by the act of reproducing. Nor is he prevented or blocked out of reproducing with others, at an evolutionary level. A woman is at great risk for mating with a man who isn't a good provider. If he abandons her, she's stuck. This was the reality for our ancestors, and those preferences are baked into our genes. The opportunity cost of mating with a loser was horrific for women.
In case anyone thinks that preference is cultural, it's not. It exists across every culture on the planet, not unlike the biological attraction men have to women who display physical features that are indicative of high fertility.
Biology is brutal and doesn't care about fairness or morality.