Like Leon , I think fewer than 10 percent of the collecting population knows about Net54 and I think probably the same percentage of cards are actually graded.
The percentage probably goes up quite a bit for rare cards but still probably hits in the 25 percent range at best, maybe higher for the big four of T206s. I know of 4 1952 Topps Mantles in albums within 60 miles of me all owned by collectors over 60 that have no interest in TPGs.
Just an uneducated guess?
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