I used to have categories for every arcade and pinball manufacturer and had multiple categories for all the various types of parts, cpus, bezelz, art, etc etc and everyone here said to combine it into fewer categories until it filled up some. But it has never filled up. For as little that has been ever been listed in the arcade areas, we have sold a decent %. Early on there were a few cabs sold. You guys just need to use it and then promote your listings in the KLOV auctions forums just like you all do with your Ebay auctions.
We feed all our fixed price/buy now listings into Google search also, so your items are also found by people searching Google so that get your items some visibility too.
And if you haven't noticed a large % of the stuff on Ebay doesn't sell either yet people still keep paying to list their items over and over again. Don't count GG out yet.
I've just restructured GG into an LLC and we are now pursuing funding. The next year should start getting quite exciting. I am trying here guys, but some listings in the arcade categories would do wonders. Give it a try. And if any of you have want to see new categories added, just let me know. If it makes sense I'll do it

Imagine how many items would be on it if you all used it for all your listings the next month. Fill it up the arcade categories and I will do my best to promote it.