It's hard to find a wife who has any interest marrying someone who makes $1,000-1,500/month when you're in your later 30's, 40's or 50's. It's also hard to support a family on that income.
I know several guys in their late thirties to early fifties who make that much money, would love to get married and have kids, but haven't been able to.
I also know someone who made 65k a year but his wife didn't feel like that was enough to raise children on.
I really think a lot more than 1% of the population where they feel like money is an obstacle that keeps them from having a family.