I think it's very challenging for Apple. Apple is making a skyrocketing revenue because iPad and iPhone sales has boomed. But iPad won't sell for 300K piece everyday, that only happened the first day... actually it can sell! Yes, but there is an interesting point (so that it sells at such high rate): Apple "must" dominate the market.

For the iPhone, the competition is now fierce: Android, BlackBerry, Palm, Windows mobile and Nokia! Nokia is already a major player, they won't let Apple take the market easily and cheaply. They'll do marketing, new phones and crazy things to preserve their position.

That said, as competition is getting though, Apple has got to spend more on marketing and improving their products (taking down their profit, even if their sales are up, because they are spending more). Only if they dominate the market, then your investment will pay back.

My advice is: don't get in this stock. It's very risky; unless you believe that the iPhone and iPad will become standards ;)