I sold my saddle on there a couple of weeks ago and it sold first time for £600. I only had a couple bids though so I think I was just lucky that the right person came across my saddle.
The saddle I sold on eBay before that was only a £50 saddle and it sold on the 5th time.
Other options are to put ads up in tack shops or give it to a saddler to sell or px it?