Yes it is very hard to sell saddles right now that aren't a name brand so be prepared to take a little loss$ and just be patient. Take some good photos of it (matching pad, etc on a nice well groomed horse) make the ebay
listing look really good - that will help a BUNCH but the others are right - the bidding you get won't be top notch. That's just the economy today. If there is a newer saddle you want, sometimes the dealers will take it as a trade in and knock a little off the price of a new one. You might try that!
The problem with custom saddles is that unless you can find someone who likes the same style and colors as you, reselling is almost impossible. Everytime I buy a saddle - especially expensive stuff - I but with the intent to resell down the line or at the very least, I make sure I set myself up to have that option if I need it. As a result, I tend to stick to name brands and more conservative designs and such and have really good luck over the years with that. It might be something to consider with the purchase of your next saddle or other big ticket tack item.
Try Craiglist, too - you could also post flyers at feed stores and places like that. Good luck! But be patient - it might take a bit of work and a little bit of time to move it along.