Scarcity is scarcity. The only germane thing is the number of copies known of the item. By most estimates there are sixty to seventy Wagners. There are ten BN Ruths. The Ruth is 6x-7x scarcer---end of story. What you are looking at is the relative scarcity of the card compared to others in the set it is part of. Taking your argument to its' illogical extreme a unique card that was not part of a set would have a ratio of one and not be considered rare.
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