Is Apple too Big?

I know everyone loves $AAPL, and the iPhone and iPad are great.


But the company has a $300B market cap. Does valuation matter or is this stock immune?

Apple is also a big component of the NASDAQ 100, the QQQQ.

It's a great company and they've hit home runs with their latest products. But this story with the big valuation and must-own seem oh-so familiar.
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Heck, I received a gift card for Christmas so I will be shopping at the Apple store soon...