It would appear that the eBay user that listed the center was either oblivious to it's function or how it was supposed to work, or they figure if they say everything they sell is sold as-is they can somehow circumvent any possibility of receiving negative feedback.
I guess that's not working to well for them though.
It's noteworthy that you will probably guaranty your Monitor Audio Gold Center (GRC) to be in full working order, and yours appears to be in much better condition than the one that recently sold on eBay. Also, you don't have a bunch of negative feedback, especially here.