What you’ll find with STW over eBay is you’ll start with the eBay top price, and people will start asking for a fiver off, or free postage, or maybe tenner for cash etc. etc. and before you know it you’re not getting the price you were expecting. Then someone will point out some random shop has a 50% off sale and its cheaper there new blah blah.
Some Ebay stuff can go for crazy prices. I bought a bike on, previous years model just for the frame. Sold the bits on eBay, most went for more than you could buy on CRC and the frame ended up costing me nothing.
You pick – eBay, potential better price (marginally offset by fees), sold in a week. STW – better karma.