Warren Buffett collected money at a young age. By 14 he owned a farm, in which a share cropper shared profit with him. Buffett likely had the goal to be the richest man on earth, but still conducted his life to keep the feelings of others in mind, and to be highly ethical.
Buffet did not just make money for the sake of it, but for the thrill of it. He was a man who followed the natural intellectual development of his business. I suspect, like most billionaires, it was Buffet's curiosity and fascination which drove him, and the money flowed afterward.
Buffet refers to his business almost as a series of happy accidents. Something that came together from an expression of himself, but that was not necessarily planned. As if nature put together Berkshire Hathaway, currently one of the top 20 largest companies around. I think many entrepreneurs: Bill Gates, Google, etc...would espouse this view of business. That nature was waiting for it to happen, and like an idea of its time, it came together like art expressed by one individual over a life time.
This is a great read about life and business.