I realize that you don't want to lock categories, but pretty much every day for about 2 weeks now, I have to go in and remove duplicate listings from the SNES category.  I know it's 99.9% complete (Allowing for label variants, etc.), so I don't see any reason that it should remain open.  The same could be said for NES as well.  These are the two sections that I spend the most time in removing duplicates.  If there's nothing left to add, what is the point in making more work than is necessary?