You're baffled people aren't having kids? What bubble do you live in? People straight up can't afford housing much less children. The avg American is completely priced out of owning a home right now. Edit: the replies - y'all are out of touch. Visit an average family in the Midwest with a household income of < $100k/yr that doesn't own a home yet.
I'm baffled my peers , who absolutely could afford to, still have no interest. These are people making 150-200k (and at my prior job, 200-400k).
If I had a kid, I'm sure I'd love them, and derive joy from them, but I don't believe the trade off is worth it. Maybe I'll end up being wrong about that, but I'd rather grow old and regret not having kids than regret having them. I think people shouldn't have kids unless they are really sure they want to be a parent. Anything less sounds like a big mistake.
Anyhow, have you actually talked to your childless peers about this? Hopefully there are at least some with whom you feel comfortable bringing up this kind of topic, with people who will give you a thoughtful, non-judgmental answer. I think you might find that they all have a variety of reasons for not having kids, and money may not be a big factor.