Apple isn't running a lemonade stand. This is one of the most sophisticated manufacturing/sales organizations in the history of humanity. Have no doubt that they have a very good idea about what initial demand will be, and the fact that they didn't have even 10 minutes of stock on hand is a strong suggestion that they didn't care that they had insufficient supply to meet the demand for the people who cared enough to be shopping at 5:00 a.m. Of course, I bought it anyway, but it's just one more small indignity that in totality can add up to death by 1,000 cuts as Apple whittles away it's substantial decades long goodwill with me.
Manufacturing lemonade is not the same thing as manufacturing a hundred million electronic devices in the span of a couple of months. Obviously there is a limit to what can be produced in a given time. Well obvious to some people I guess.
But hey there's always Android. Always plenty of those turds available on release day.