Indeed the prize was mostly a stimulus, not a payback.
But the payback is clearly in licensing the technology
and carrying paying passengers up in space, and the
deal with Richard Branson's Virgin clearly show that.
I wouldn't be so sure about the Microsoft dude though.
There are plenty of people with big bucks. I'd rather
think the merits go to people like Rutan and the rest
of the engineering team, for taking small steps toward
the final goal instead of risking everything in one lucky
shot.
Ciao ciao!
Manu