[sp527]

Legacy is terrifically important to many wealthy people. Many are in fact motivated towards wealth and success because of it.

Depending on how you define it, children are actually a much more reliable way to have a reasonably enduring legacy than businesses/foundations/accomplishments/fame/etc, though both approaches are ultimately ephemeral. You probably have to successfully make it at least three levels down an ancestor tree, rooted at yourself and with an average replacement rate around 2, in order for your own genetic legacy to have a high statistical likelihood of enduring through anything short of a species-level catastrophe.