yeaaaaa... I dunno about that. GSF is a little wonky to use, but I used to sell a lot of things on eBay and its gone downhill. Way too many people bid on things, win, then back out of sale... sellers using "ghost" accounts to bid up prices... inaccurate descriptions w/ no good recourse... and don't forget that you have to pay FEES on eBay, whereas GSF is free.
Certainly eBay is a more professional venue, but I don't like it anymore. I'll live w/ the slight goofiness of GSF to not deal w/ eBay when buying/selling UL gear. After posting here and getting little interest, I have sold a fair bit of non-UL stuff on Geartrade.com. It does have fees, but guarantees payment, easy returns, no time limits or worry of selling for too little. For me, eBay is pretty much last resort now.