The Ubuntu Welfare Program
Since its inception in 2004, Ubuntu has been the beneficiary in what seems like a bottomless money pit for South African entrepreneur, Mark Shuttleworth via his commercial support and development venture, Canonical. Since Canonical, Ltd. isn't an American publicly-owned company (and I don't know South African law), it's unlikely that a full disclosure of profits and losses is forthcoming. I have read that the investment made so far is approximately $20 million US.
How long can anyone keep pumping money into a project that might not ever turn a profit?
Red Hat is the world's most successful Linux-oriented company and has turned its open source business into a very profitable one with licensing, professional services and support, training and certification and other products like JBOSS.