What could be a very simple fix here, and i believe would convince me and others to buy these, would be if spare duplicate monster chits were provided with each figure. As others have said as well I dread the wear and tear of sliding the chits in and out the monster bases and so having one chit for the monster bag and one chit for the actual monster would work well.
For the wear and tear reason alone I'm not tempted in purchasing these (except maybe the Dunwich Horror
) and I'm normally an OCD obsessed must complete collection type of person.