Apple's stock will always be an up and down stock, because they don't pay a dividend. So if the price stagnates, for any investor that's dead money that's not growing or generating revenue.
Stocks like Apple's are high risk in some ways, but also high reward if you go big. If you'd spent $50,000 on an apartment 5 years ago in a fashionable part of Brooklyn, NY, it might be worth $800,000 now. If you'd spent it on Apple shares, your investment would be worth more than $1.5 million today.
70% of Apple's shares are owned by corporations and mutual fund holders, and with around $18 billion in the bank (and rising), Apple could quite easily afford to go on an aggressive share buy-back scheme should the price get dangerously low.