Also there is a perception (right or not is up for debate) that the "innovation gap" has narrowed between AAPL and its competitors.
I'm an old guy now, who wants more "stability and divys" and less "growth with risk". If I was 25, I would have no problem socking some substantial money into this equity.
Cook said directly on the earnings call that the split was to help bring in the retail investor. And no the law of large numbers prevents their growth rates from continuing.