That makes as much sense as Google making Chromebooks run Windows to sell more of them. There is not much money to be made in the Android OEM market unless you're Samsung(and even their profit is falling precipitously). I think the world has enough Android OEMs and that Microsoft has enough cash to burn.
Your point is moot. The whole point of Microsoft running Android is because of the ecosystem and ability to appease to the greater market who already use and are familiar with Android, love its selection of applications and games. It is all about the market share and awareness.
A Chromebook running Windows would be pointless because the point of a Chromebook is to not compete with Microsoft or even the laptop market, Chromebooks are going for a subset of the market that a lot of manufacturers and companies like Microsoft are not interested in targeting: the low income earner, the student, the user who only surfs the internet and watches Youtube videos.
You are comparing a laptop running a desktop operating system with a phone running a mobile operating system. Two completely different things and markets.
