At Le Web 10, Automattic founder Matt Mullenweg and CEO Toni Schneider were interviewed by TechCrunch:
Here're some important notes:
How big is WordPress?
There are about 30 million publishers right now. That's roughly 10% of all websites in the world. We're currently getting about 300 million unique visitors on WordPress.com a month.
Are you making money?
We're focused on growth right now, so we've invested a lot in infrastructure and so on. We haven't been focused on revenues so far, but I can tell you we're break-even.
How big is the company right now?
We're about 74 people. In terms of revenues to sustain our growth, I'd say we make a little under $1 million a month from all our services combined.
(TechCrunch: that's roughly $10 million a year, based on that statement and what we've heard from other sources.)