One of the really hard things about all the trials of this biz is that Civilians don't get it - that includes most family members and lovers, too - the other day, my own sister Tami said I was probably pinching myself over my "good luck" in getting these two upcoming gigs... for one of which I've been haranguing the producer to put on, for 16 months; and the other I've been campaigning for during the last 5 months... it looks to the Regular Folk like we just fall into these "Good Luck" jobs. Selling a product or service -- ours, included -- is Marketing, just like in the Real World. But cuz it looks so fun and easy, "They" can't know what we go through to be allowed up there in the light when the curtain opens...
I don't think those "civilians" are so terribly off-base in congratulating you on your good luck.
It's certainly true that landing a gig takes a lot of hard work, work that "regular folk" might not be aware of.
But go watch a celebrity interview (as regular folk often do) and you're very likely to see some star attribute his success to luck, in some measure.
I believe that, in auditioning (as in poker), there is always a certain element of luck involve. You can give the greatest audition ever given and, if you don't match the director's vision of what the actor playing the part should be, you won't be cast.
That's why there's nothing wrong in saying that Jason had bad luck -- being too small for the role he tried out for. If he got the role, we'd congratulate him on his good luck (of being the right size).
Of course, you have hard work to do, perfecting your audition, and marketing yourself for a gig, but there's an element of luck in every aspect of show business, and I don't blame "civilians" for acknowledging it.