They don't live and die by one product. Its just that one product is ridiculously more successful than the rest. This makes their stock value more volatile, but

They don't live and die by one product. Its just that one product is ridiculously more successful than the rest. This makes their stock value more volatile, but as a company changes not much. The iPod was once the crown jewel, then its sales dwindled and now its been absorbed into a new form factor.