You know, I asked myself the same question... here's my answer. Yeah, it might seem biased, but here goes.
Men are pursuers. Women have to wait to be pursued. Women can do things to improve their chances of being pursued, but if a man doesn't ask them to marry, she ain't getting married.
If the supply/demand odds are in favor of men (especially black men) and they can take their pick of reasonably decent women, then a man who chooses NOT to would make me wonder what's going on... is he trying to still be a playa? Does he have a harem and won't commit? What's up?
Now I know that men will spin it the other way, but I always say that since THEY ask and they have a numerical advantage, I see less of a reason for them to be 35+ and sit on the sidelines than a woman who might be waiting, but is on the losing side of the numbers game.
ITA. It's totally different for men and women when it comes to marriage. It may not be fair, but men can get married whenever they want and usually they're not as gung-ho over it as women are.
I just got married to a divorced father of 3 almost 2 weeks ago. As a 30-something, I didn't want to risk waiting 5 years to get married and have children so I didn't have time to waste on a guy who had commitment issues or just wasn't marriage material. Everyone doesn't have the personality that is suited for marriage.
It's sometimes not a positive that a man who has options would remain single well into his 30's and beyond. Even professional and childless men start to think about marriage in their late 20's and early 30's as more and more of their friends marry. In the workplace, it's kinda "expected" that a stable male employee will be married, even if it's just a wife that only sees him for a couple of hours on the weekends.
Also, I had grown up with an uncle with serious commitment issues. He looked great on paper, and is to this day still looking for "Ms. Right". I've seen sooo many women come through hoping they'd be the one to tame him since he was in his mid 20's and are still hoping to now that he's pushing 50.
As I got into my 30's, I started focusing more on divorced guys. Yes, a childless never married man is ideal, but with a divorced guy, you do get a guy who is capable and wants commitment. You do see what kind of father he is by his relationship with his children and how well his children turned out. You get to see how mature he is by how he treats his ex and their relationship with each other and the reason they divorced. You do have to love children, but most of the time the woman is the primary caretaker with the man not getting to see them as much as he'd like.
I think it's fine to insist on a childless man if that's what you want, especially if you're only in your 20's. For a 20 something, it should be easy to find a childless peer. For 30 somethings, I think sometimes people make comments about it not because you're selfish but because sometimes you may be tossing aside some very good men for a reason that may not be as important as you may think it is. For 30 somethings it's also time to face reality. Waiting for the perfect guy may mean cutting down on your chances of giving birth to a child of your own. 30 something men don't have to worry about this as much.
So I think it's just a matter of what you really want and what is most important to you and no one should make you feel bad about the decision you've made.