I've sold dozens of cymbals (and drums!) on eBay now...it's how I keep cycling through new kits all the time.
Some tips...
- Clean the cymbal up if it needs it, try to clear the finger prints. People are shopping with their eyes first.
- Take exceptionally good pictures of the entire cymbal, the hole and the logos. Use good lighting behind the camera.
- Keep your description brief but professional. Make sure you use a good title in the eBay listing because you could keep your price low by making a simple mistake. For example, saying Sabian "Chinese" in the title will exclude you from all "China" user searches. D'oh! Try to use "Cymbal" in the title, if you can fit it.
- Be friendly, answer all questions and remember that the peeps are your customers.
- Ship same or next day upon payment and give the customer a tracking number as soon as you have it.
- When packing, put it in a bag first and then find a suitable box with plenty of room for the edges. Pad the edges well, as well as the rest of the cymbal.
Don't start your cymbal at the full dollar value you wish to get for it...you're only hurting yourself. eBay is a game...it's a market-place. The lower you start your price, the more watchers and bids you'll garner early on, in the auction. I usually start mine at just a few dollars. Everyone's worry is, "it'll sell too cheap!". Not usually...you're chances of getting a good price go up if you start low. If you're still too worried, do a Buy It Now listing instead...but check to see who the cheapest seller for your item is, first. Match or beat that guy.
Good luck!