your analysis is wrong, it's not because a game sells a lot that the console itself has a high value... this could just mean that the people like the console... but there is only that game on it that they like?
the real factor is the tie ratio (which you did refer to). This shows how much enjoyment (measured in quantity of games bought) customers get from their console. However this means that you should also consider all the aditional extras of the others in there too.
But one thing is true, the Wii has the most value, because it's the only one with nintendo games on it... and that's always be the case (look at gamecube sales, lots of games at 30% + tie ratio, all nintendo, you could buy only nint games the whole gen and be above the tie ratio of a nint console for the gen).
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