"Luck" evens out. I'm sure it's just because I'm a Bears fan, but it seems like nobody calls "luck" when the Chiefs get it, or the Packers, or the Steelers, etc. etc.
And the thing is, you have to be in position for a so-called bit of luck to affect the outcome. So yeah, it's not like I think there's no such thing, but for it to matter a team has to hang in there and take advantage.