A - Blizzards goal With D3 is and always will be to duplicate the longevity of D2 and the selling of items for years after the games initial sales, taping into a constant revenue cash stream.
B - to achieve that goal, the game will be designed around the RMAH. Even if that means subtially pushing players into the RMAH use and everything else about the game taking hits through limited and poor design for the overall goal to succeed.
Everything is meaningless when compared to the goal.