Why does a Pedigree Coin command a higher value-----and should it ?

It seems coins with a Pedigree to Eliasberg, Bass, Wayne Miller, Jack Lee etc. command a large premium (25% +) over similar coins that do not have a pedigree. Is this just another example of people buying the plastic and not the coin, or is there real long-range value in such coins ?
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Of the folks you mentioned, I am most impressed with Eliasberg, but it really is a coin-by-coin issue.
Some are just "names" on a slab.
If there is no real history behind a pdigree it should be ignored and buy the coin, not the holder in these cases.