Another thought that occurs to me is the 1883 nickel. When it was minted without cents, many people saved them. Then when they changed to the version with cents, not many were interested. MS60 $175 with cents, $32 without cents although the with cents had a higher mintage.
Look at any price guide. You'll see many much higher mintage Lincoln Cents in MS 64 selling for a lot more than the 31-S. How many people saved those very high mintage cents?
What do you mean by d/d? That would mean a RPM - Repunched Mint Mark D over D Or do you mean DDO? Doubled Die Obverse?
You are comparing Cents with Low Mintage values with Cents with Varieties.. 2 different things so they should be kept separate.
Well, here the short, skinny and the real truth. Although NGC, PCGS and a new 3rd is in the business of Grading and valuing, they ALL 3 use sales from Ebay, Amazon and a few other auction sites to ascertain a value yet, ALL these sites are "discount" sites and do not sell at retail. Because of this, even the 1931 S Lincoln cent is under-valued mainly because no one goes to these sites to pay top dollar. On the contrary, coins are sold at discounts and are great deals but, they are not indicative of the actual intrinsic or numismatic value in the least including the fact Grade and population of such is also NOT used. So, I caution you not to use NGC or PCGS as guides to value but, do use them to understand low population then, take they value and multiply by 3.89 to gain the nearest "real" value. I hope this helps.