Too much ambition vs very little ambition?

My dad always used to have too much ambition. He was never satisfied with anything and was always chasing money. He always wanted to become rich.

I never had my fathers ambitions, however my ambitions are stronger now however. I'm looking for a job these days and trying to be a better partner for my girlfriend but it still feels like I'll never have as much ambition as my dad had. And is it necessarily a bad thing?

I don't want millions of dollars and all that materialistic stuff. I want just enough so me and my gf could live comfortably. I'm generally more easily satisfied and I never really understood why or how my dad had so much ambition.