I am concerned about the question why many American coins have a low grade in slabs. Most world coins cost nothing if their condition is lower than MS.
People would not spend money on coin value if they were sure it was just a waste of money. On eBay, there are a lot of good coins with grades of FA2, AG3, G4-6 and so on. So this action has economic benefits. Understand me, I live in Russia and I see that Russian coins even of tsarist Russia are not interesting to people if their rating is lower than MS60 with the rarest exception.