Google doesn't care about anything other than advertising revenue
from Android and making cool things to play with.
FTFY. Googlers are geeks who like technology for technology's sake. They are also sensible enough to understand where most of their revenue is from.
I don't and have never run cyanogenmod, primarily because the Android phones I've owned are newish and updatable/moddable without hacks like cyangenmod. That being said I'd honestly estimate that number is a measure of active users. The community is HUGE. The site you linked to also includes this: But that counts only users who have elected to share data with Cyanogen, he says, estimating that the true number is two to three times that amount. which I feel there's no reason to doubt considering it's open source, free and run by geeks. No one would be able to measure it, except cyanogenmod themselves so you're not going to find other figures.
Because they're in the business of selling your buying habits
Unless you know something I don't know this is entirely untrue. They're in the business of utilising your buying habits for their own financial gain, not on-selling it to others. They've invested all this cash in building what they are... why would they then offer that to anyone for a fee, considering it is that inside knowledge that they leverage to be the biggest advertising network on the internet (by a massive margin)?
[Mods, can we turn this "similar body" warning off for edits plz? Of course it's similar, I was correcting a typo!]