Probably a combination of a career-first mentality where they don't have the time or inclination to seek / maintain lasting relationships, and also having the means to not raise their own children. To these people children are not burden in the same way as traditional parents because they hardly contribute to raising them; instead they are just another play-thing.

There may also be some game of thrones shit going on where if a boss and a mini-boss have a baby it solidifies rank and power.