Is this a peculiarity of the US? Income was never an issue when i got the hots for someone...especially when things turned into long-term commitment. In fact, quite the opposite.
Of course these are generalities, but they also fall out of the game theory of dating. For a woman, choosing a partner is extremely high risk as she will bear the children, will redirect energy away from her career to raise them, and will, most of the time, end up raising the children alone if the marriage breaks up. Men don’t really have any of those concerns because there’s not the same expectation they would raise the children on their own without help. I’ve known plenty of guys who ran out on the kids and zero women who left the kids with the guy.