Free time I guess is a big one. If you value the 'hanging with the boys', clubbing, or really any solo activity it certainly would be a shock. By the time mine came along, I was done with most of that anyways I guess. But my own free time - watching TV, playing games, reading books, or just scrolling on my phone, was largely replaced with building legos, having nerf gun fights, playing board games, etc. One 'hidden' benefit is that you get to be a kid again without seeming weird, and kids toys todays are so much cooler.

I do think 'selfish' was too broad and strong of a claim. I was focusing solely on the thought of people who make way more than enough money claiming a child would ruin their lifestyle/break them. In reality, there are tons of other reasons a person may not want a child that aren't selfish at all.