A major rebuttle to learning of a person's success is "They were just lucky"! Although luck and being in the right place at the right time can play a factor in success, it is moreso based on a person's knowledge, skills, training, work-ethic and risk taking. If a person has an opportunity presented to them, they are the ones who must act on it and put in their full effort to assure the desired results are achieved. If an opportunity presents itself for a person at the right time, obviously the person had the skills and background needed for this opportunity.
People are successful because they did the right things to become successful. They took advantage of their so called "luck".