A part of the human nature is to keep pushing ourselves, keep improving, never becoming fully satisfied - this has resulted in great achievements for our ancestors. This urge to keep improving is a lot stronger for some people than others and I think it's very strong for entrepreneurs.

The bottom line is that I don't think the urge for success is driven by a longing for love and approval, but an urge to keep improving and keep getting better. That's at least my drive :-)