People are paying 25-30 for PSA 9 1st edition Jungle Eevee and Pikachu commons. This will probably be the same for most 1st edition commons at least soon.
I’d say there’s a market for 1st ed Base through Fossil commons & uncommons at PSA 9&10. I recently completed 1st Ed. Jungle and Fossil commons & uncommons in PSA 9. I was more than happy to pay a premium for some cards just because finding them already graded was a pain in the ass
The Commons and Uncommons are growing. They are growing slowly, but they are growing.
I think there will be a time in the future where $50 will be the baseline for every 1st Edition Common and Uncommon in PSA 10. We are already beginning to reach that point for some of these cards.
So yes; there is certainly a market for them, especially for set completionists.
i would binder only lightly played cards and grade the rest that are 9-10 possible. If any of mine came back an 8 i would probably break them out and binder them if i dont have that card in the binder already.
For me keeping them ungraded is way more pleasant. Binder sets of pack fresh cards are so soothing and easy to enjoy. Also they cost WAY less this way. Storage of unc/com cards in PSA slabs is incredibly difficult and not very pleasant to sift through. That’s my 2 cents about it but there is plenty of market for unc/com currently - just not as much for the era of boxes you are speaking of. Mostly just wotc.