Our core values at least regarding money are determined by genetic factors as well as the social class we're born into. Barring some sort of neurological damage, they do not change over a lifetime.

It's hard to imagine what kind of a billionaire I would be. I'd probably move to a tax haven in order to be able to decide for myself what kind of charitable work some of my money would be put to. I'd probably invest in technologies I considered having potential for profit and social good. Medical would be a large arena.