Re: Profit not volumes
Profit = the difference between the amount earned and the amount spent in buying, operating, or producing something.
Amazon make an enormous amount of money. However rather than sitting on it and admiring it or spaffing it at shareholders in great chunks they chose to continually re-invest the money.
It's basic business finance where if you record a profit the government will help themselves to a huge chunk of it (at least in the UK) therefore a good business accountant will always manage to offset the amount earned against investments, costs and other reasonable expenses to ensure that what's remaining is as low as possible. This is why international companies shift their profits to the most corporation tax friendly country as it's the difference between losing 40% of your profit to tax or considerably less, e.g. 1-2%.
As for stock market "worth" this is a total nonsense market as the perceived value of shares is usually down to pure speculation and greed rather than any particular indication of a company's value or business prospects.