Horace Dediu has a great take on the reputed differences and actual similarities between Apple and Amazon:

What I take issue with is the premise that Amazon is the “anti-Apple” in its hunger for growth and patience for profits. Apple has its own “Amazon-like-business”: iTunes has been growing at a steady 25% or more and it also has its ancillary zero-profit hardware analogue to the Kindle called Apple TV. iTunes is a great business in the Amazon vein, harvesting hundreds of millions of users (and their credit cards.) Presumably iTunes could also some day “flip the switch” and become profitable, but something magical needs to happen. Something like becoming a payments processor or retailer of other things. Analyst beware however. There might be conditions that make such switch flipping extremely difficult.