what appears to be "luck", is likely a lack of understanding of universal laws. while items/events appear to either be fortunate, of unfortunate, in both cases, there is equal balance 50/50 at all times of constant support/challenge.
no, i do not believe in luck. our inner most dominant thoughts create our outer most tangible reality. more like P.E.A.R Our Perceptions, yield an Emotion, which produces an Action, to give us a Result. great question btw.