You certainly have coins in your collection, which are only “placeholders”, because of a lower grade, than you would have liked!
It would be nice, if you had the opportunity to put a parameter somewhere, saying “Dear Numista, please ignore all my coins below ”GRADE" for any swap and mark those coins as “missing” in my collection.
This would mean you would be offered those placeholders again, and then you would have to see with your partner, if the coin he's offering is of a better grade than yours?
PS. Of course, you already have this option: Don't enter your placeholders in Numista!

