Your call, Cochise. I doubt they are going to be worth anything at all, since everyone went nuts and hoarded this pointless item by the dozens. As for clean-up point, I expect you're looking at 3-4 years before they are worth anything in that regard.
My advice? Keep em till you need the space, and when you are reaching capacity, dump em in the trash.
I collected the Holiday Busts by the bushel when they came out and hoarded them away, I had like 2 chests worth. I was thinking if I waited long enough, they would be worth something.
Years and years passed, and six years later they still weren't worth crap. They were usually going for like 5k, if that. I threw out a bunch of them, but still held on to a few dozen just in case. It was vindicated, of course, with this last clean up, where the busts were worth a good deal.