I enjoy people. I started at one of the lower rungs of society and have been able to do well for myself through a lucky concoction of genes, being born in the USA, and having the body of human knowledge at my fingertips. Not everyone is so lucky, and I imagine if I ever come into some serious money that I'll be using it to level the playing field for others. The effective altruism movement intrigues me as well.

Yes, altruism balances egocentrism.