Damn good point and I thought AMD's whole stance was for performance per watt as well as price per performance. I'm disappointed.
You cant have everything. The fact is the more powerful the GPU then generally its going to need more power. I think if this card can BEAT out nvidia in price and performance ( Pretty much already is ) then you have already got a winner of a card. I think there is only so much power conservation you can do with this kind of product.