What Geof said. Once in a while I’ll buy something from a professional Ebay vendor, but I haven’t tried to sell anything there in years. Too much trouble, too few sales, and any benefit is mainly skimmed off by them. I prefer TWW and other free classified sites, although, truth be told, I rarely put up ads. I’m more likely to haul my cast-offs to a convention flea market, if I can get a free table.
The Wargame Miniatures Marketplace on Facebook is a happening place, these days:
You'll shoot your eye out, kid!