Back when it was $4/share I owned a bit, sold it at about $100/share and made out nice. Wish I had bought a ton more, but again, the goal of investing is to be able to sleep at night. If you can't sleep, you are investing money you can't afford to lose. Sell something. The challenge I have with Apple is when do I sell? They just announced earnings that blew out estimates and the iPad has got a huge future. How high do I think the stock will go? No clue. Will I sell if it hits $300/share? Probably not. At some point, I will sell my initial investment so I'm playing with "house money". I guess I'm saying the estimates of the stock price by the "experts" don't mean much to me. I will sell when I don't think, based on the market conditions, the upside is as big a risk as the downside.
Anyway, why did I buy Apple? I know the product, I see the potential and they have momentum. Is it too late to buy Apple? I don't think so. I think it will pass $300/share this summer. Just my opinion. You decide for yourself.