I mean, I can understand not wanting your children to grow up in poverty. And I understand if you're a woman looking to have kids, how it would seem practical to seek out someone who has a well-paying career ahead of them. It's definitely very, very hard to maintain happiness if you're constantly struggling to get by.
But money isn't enough. So many adults underestimate just how perceptive children are to the things going on around them. Children also tend to internalize and personalize the unpleasant things happening around them, especially if these things involve their parents. Most people also don't realize just how much of a mindfuck it is to be raised by two parents who hate each other but refuse to split up "for the kids' sake." Divorce is pretty hard on kids, but I can't imagine that it's worse seeing nothing in their immediate vicinity but two adults with no love for one another, especially when this misery is justified by (which to a kid basically means faulted on) the existence of the kids.