The problem with trying to structure eBay categories to make the buyer's job easier is that the SELLER must understand the category names and put his auction item in the right bin. Many good items offered for sale are in the wrong category, and if you as prospective buyer are to find them, you must look at categories other than the one that applies to your primary interest. If there were a category for "Chips, Home Play" or Chips, Fantasy" you can bet a lot of real casino chips would end up there because the seller doesn't really know what he is selling. So you have to looked at the "new" categories as well if you want to find the bargains.

My contention is that the buyer is better off refining his list of descriptive words for a good search, both those to be included and those to be excluded. This is a never-ending task, particularly for the excluded terms, as sellers of junk continue to come up with new descriptors for the stuff you don't care to see.