I always seem to lose dustbags. I think they run off with the socks to leave me with a bunch of socks that don't match and bags that aren't in the cover they should be.
Yah, it's pretty stupid that ebay won't go after all the fakes/counterfeit listings, but will go after the actual dustbags that come with authentic bags.
I'd list them on bonanzle or ecrater. I know there are many people that want them (myself included).