1. Microsoft is the second richest company in the world after Apple. It used to be richest until last month. In the deal they made with Nokia, the latter won't be using Android and MS will give them a huge fat check every quarter. I think they were given 250million last quarter.
2. Actually, Samsung is like the only Android manufacturer actually raking in cash. HTC isn't exactly doing so well, as their quarterly earnings report last month shows that they've experienced a 70% decrease in income since the same quarter last year, and they're already the second biggest Android manufacturer at that.
3. Windows is still young. Remember, the only time that Android actually started becoming a threat to Apple was with the rolling out of the Galaxy S and the subsequent 2.2 Froyo update. Before that Android was still trying hard to catch up to sales. That was about 4 generations of Android before the big climb started and Nokia's market share was eaten into by Samsung. So far we've seen 3 Windows OS generations for the mobile market.
4. Windows actually shows so much promise. Apps that are so well integrated into the device that iOS falls to shame, and a level of open-ness that while not comparable to Android, is enough to give freedom to developers and their ideas.
5. And personally, I'd prefer a 3-horse race. More competition should push more innovation.