I'd also like to add, the original topic of this post was the "Total" cost ofownership not just the cost to buy the system. I consider electricity in the cost of my items. I buy things that are energy effecient and specifically look for these things. In terms of energy effeciency... Nintendo is a clear winner in both energy conservation and energy cost.
I know a small handful of people that DO care about this and it is a factor in the cost of a system if you ask me.