The goal of a successful company is basically serving those two sets of people, Google may enter the retail market or real estate, or McDonalds will take over Cloud Computing -- they're all just trying to get a consistent return.
Amazon doesn't give money to investors. Late investors give money to early investors. (Edit: Amazon has bought back some shares in the past, but that's far from even offsetting all the shares given away to employees...)
You mean "Amazon hasn't given (much) money to investors so far". It's an important distinction, whether you agree with their argument or not.
In a way this is supposed to be the end-goal of free markets right? No profit left for companies to have?
Razer thin margins are still better than the zero margins that they would recieve by NOT entering the market.
If it is possible to make any money at all, then there is no reason not to take it.
They should be going into high margin markets, not just markets that have a minuscule profit margin.
It seems to be their strategy is to enter markets that traditionally have razor margins, but the margin can be increased with careful application of technology or scale.