AFAIK the N9 sales have not been mentioned. I very much doubt anything more than 100.000 . The N9 is relatively expensive, not marketed well, and hard to get outside of select markets.

But I don't care about the N9 sales figures anyway. I love my N9, best Nokia I have owned (but my N900 is still very good, a totally different user experience).

The Lumia 800 also isn't bad, but the bigger screen of the N9 alone is reason to prefer the N9 over Lumia 800.
The user experience of Windows Phone really is pretty good, good looking, smooth and simple. In a lot of ways similar design goals as the N9, but implemented differently.
A shame Windows Phone doesn't integrate with any services/software I use, so for me Windows Phone is a bad choice.

Nokia just had a lot of bad choices, and picked one. Continuing any Intel development would have been deadly. Just now is intel introducing a SoC that can actually be used in a phone, and it can't compete with the next gen high-end ARM SoC systems in any way (CPU, GPU and power).
Also Symbian, MeeGo and Windows are problematic.
Windows will be going through a rough transition to support ARM on NT kernel, and Intel will probably switch the windows phone platform to the same base.
MeeGo/Tizen (the Intel mix) is a buggy distribution that isn't ready for prime-time, and ARM support in other distributions is also in very active development, and not nearly as mature and optimized enough to compete with iOS (just look for the presentation of ARM on Ubuntu and look at the time it took Nokia to get Harmattan performance up to spec.)
Ask any developer that tried to port a game from iOS/Android/PC to Symbian, what they think about the platform. Symbian has improved, and does offer pretty good performance, but really is outdated in so many ways.