Its not so much an exception as a predictable response. Admitting something is luck is a display of weakness (in pretty much any culture, I'd imagine). You're far more likely to encounter such displays by those who can withstand it. Buffet has nothing to fear, he's proven more than anyone that he's among the best ever in his field, even if it's luck that he's #1 vs #100 on the wealthiest list. Every supermodel seems to claim that they were ugly or a tomboy in high school and they were just lucky that some photographer noticed them. Rookies talk about how hard they've worked to get to the pros, while retiring athletes talk about how lucky they've been.