... Several people waiting 'til the rush subsides before they buy. (At least, I hope there are. )
I'm one of those types myself. The last movie I bothered to see on opening night was Independence Day. I think I even waited a few days for a matinee of Iron Man, so I could actually enjoy it without some jerkwad next to me checking his Twitter feed every twenty seconds or something.
I never really bother with Black Friday type sales either.
But in this case, the books will be in stock for the foreseeable future, so whenever you're ready, they'll be there.