JoeK - everything Margo said is very true, I just don't think of it as luck. I think of it as fate.
Why not just "get discovered"? Because you can't. It's who you know, right place/right time, as Margo said. However, that's not luck. Luck is getting the right cards in a poker game. Luck is rolling a strike. Luck is getting a hole-in-one.
FATE - fate is right place/right time. Fate, according to Webster, is:
1 : the principle or determining cause or will by which things in general are believed to come to be as they are or events to happen as they do : DESTINY
I don't think of fate as be lazy, don't work, if you're meant to be a Broadway star, it'll happen. That's not fate - that is magic, which does not exist. Fate - you need to work hard, try try try. Never give up. Eventually, it will happen. Maybe not on Broadway or in New York, maybe not how you imagined, but you will get your break.
"The Spectacle has, indeed, an emotional attraction of its own, but, of all the parts, it is the least artistic, and connected least with the art of poetry. For the power of Tragedy, we may be sure, is felt even apart from representation and actors. Besides, the production of spectacular effects depends more on the art of the stage machinist than on that of the poet."
--Aristotle