There was a very interessting article once (shame on me that I didn't bookmark it...) comparing the strategy of Apple and Amazon. Main point was that Amazon pursues a low (zero?) margin strategy.
Guess that's what commerce should be about, cash instead of margin. Aldi, a pretty big german discounter of grocceries, works that way and became huge. That they are loosing right now against "new" entrants is a different thing.
But having seen time and again profitable companies struggle in time of crisis simply because they run out of cash, I'd rather back a company like Amazon.