Buying time before the larger iPhone 6 comes out in September. AAPL has been killed because of a lack of a larger phone. And despite that iPhone units were still up 17% and were >$25 billion for the quarter.
BRK has B shares which are 1/1,500 of BRK.A
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.