I wear mine, cause I promised the wife. Yes I have crashed badly enough to need one, and get whacked on the head by chairlift bars enough to make it worthwhile. Think we all wear them because Bell helmet put enough really good skiers under contract to convince us all we needed to (is this a great country or what?).
I-pod, you betcha! Only when on my own though, they are kind of antisocial.
Got the ear-buds worked out for the tunes, now to conquer the fogging glasses under goggles while wearing my brain bucket.