In addition to common backs that become uncommon when paired with a specific player/pose/front, some backs are just more popular. T206, Polar Bear tends to go higher than its scarcity would suggest. I bid higher on them too, just because I like the back design.
Other sets, I will prefer to buy cards that have backs that match the other cards I have. I like having an all 1-brand set, even if that brand is not rare.
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