I wondered why no one did for 2013!?
In case Raison's victory in 2011 was just luck.
Seriously, though, most people don't like how the boat looks and, given that predisposition, they were probably able to convince themselves that it was Raison's superior skills that gave him the victory, more than the boat design. Remember that he didn't win Leg 1 in 2011, but did dominate Leg 2. So probably not quite enough evidence to convince the skeptical that the scow is a superior design for the MT. That's my guess.
But if Pedote wins, then the top guys are going to realize it wasn't a fluke and the design is optimal for that race. Raison will then be able to have a very big smile indeed.