Don't get me wrong - I'm not condoning continuously missing performances. That's a performer's job, and that's what they're paid to do. 8 times a week. If you can't hack it, find another line of work or get a sit-com.
But I've also seen just as many audience members who don't know or care who's playing what as I've seen audience members who are upset. Just check the floor as you're leaving and see how many of those slips are left for the house staff to clean up. And when talking to friends, relatives, whatevers who are not as "into theatre" as I am, I've noted that the only thing they ever remember is that they've seen the show. Not who played what role, when they saw it, and in some cases what it was about. WE care about these things, but we're a very small "world."
Cheyenne Jackson tickled me. AFTER ordering SoMMS a drink but NOT tickling him, and hanging out with Girly in his dressing room (where he DIDN'T tickle her) but BEFORE we got married. To others. And then he tweeted Boobs. He also tweeted he's good friends with some chick on "The Voice" who just happens to be good friends with Tink's ex. And I'm still married. Oh, and this just in: "Pettiness, spite, malice ....Such ugly emotions... So sad." - After Eight, talking about MEEEEEEEE!!! I'm so honored! :-)