While I was fundraising, VCs told me that DHH could easily have raised a lot of money for Rails had he chosen to. I don't know for sure that that's true, but it certainly seems plausible given Meteor's experience.
Even though we chose a different path, I really admire what DHH did with Rails. We studied the original Rails screencast very carefully when were making the Meteor screencast.
That's a nice arrangement. Do anyone know about other open-source web frameworks that have managed to get so much funding?