The reason my friend is not having kid has nothing to do with economics of having kid.
He has plenty of money to support 10 or even 15kids based on the numbers some people posted on this thread.
Reasons why he does not want to have kids:
1. He dated like 5 different women, most of them confessed their love to him. But they were always busy at education/career, he lost interest in them and decided to shift focus to his career. After years, he found himself to be alone but successful.
2. After having achieved success, he didn't want to take deals where he could lose half of my income like alimony. It took a decade to build this much wealth, why risk losing it with marriage.
3. He needed love/support/care the most when he was younger. Now that he is much older, what's the purpose of all of that even if it comes to him now?
4. He told me that all the women who rejected him when he was young are now confessing that they always were interested in him. He told me that what people are attracted to do doesn't change, later in life they start supressing what they are truly attracted to for things that they logically want from others.
Not sure how many people can relate to it.