I guess, although I figure if you're willing to stay up til 230ish you can wait an extra few minutes.
I do agree it was frustrating that it was all the way at the end. To me it makes sense to put it after the animated bit of the credits.
Well it depends on their schedules, most people work day shift schedules so I'm sure they're ready to go home. Plus, the end credits on a blockbuster are much longer these days and even I don't have the patience to sit through them any longer. Especially not for 30 seconds of fluff. For Iron Man, yeah, because it basically said "the Avengers are coming" but the "shwarma" thing? No.