The 30 days full money back guarantee* is a no brainer for Jobs at this point. He's got that class action lawsuit brewing and he knows that any iPhone 4 that gets returned can be sold back just as soon as they finish reboxing it.

2 birds with 1 stone there.

And this iPhone 4 shortage (worldwide) will go on for at least another 3 months as the staggered worldwide release is being unveiled.

30 days? Pfft.

*If I'm not mistaken, the normal policy is 7 days and involves a 10% restocking fee.