Does anyone collect rare coin slab inserts?

Perhaps not as expensive as a 1913 Liberty nickel, but it could be an interesting collectible in its own right. It would be cool to have an authentic slab insert for a 1913 Liberty nickel, 1804 dollar, 1885 trade dollar, 1927-D $20, or (insert your favorite mega-rarity here), especially when you have no hope of ever owning the coin.
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I have a number of pretty rare ones from ANACS crossovers, but not in the 1913 Liberty nickel league of prices.
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