Technically, Amazon might not be into maximizing profit via cash flow. But Bezos certainly has an interest in maximizing share price, via undercutting competitors and offering the cheapest prices and maximizing market share, thereby leading to a possibility of increasing profits via sales. Any which way, squeezing every cent out of the employees will work towards accomplishing these goals. So while they may not have a ton of profit in the traditional sense, it's still all the same interests reaping the gains they always have.