Ummmm.... nuts??? Hell, I'd have been disappointed/upset if I didn't get to the midnight showing opening night. I've gone to the last 3 film openings at midnight, it's an awesome experience. And I'm seeing it tomorrow with my sister and Sunday with friends from work (yes, I'm a geek and a HP fanatic).
PS: I bought my tickets online for the midnight show - I don't care about IMAX or 3D. And we got our other tickets online in advance, too, without any trouble. I do know that I never get a great seat for the midnight show, even when I show up 30 minutes before. But that's why I go two other shows - I also find I catch things that I missed the first time around 🙂