I have had great success with EBAY over the years selling a variety of goods, other than domain names, with over $10K in sales just last year (i.e. collector cards, coins, stamps, ticket stubs, albums, etc.) However, I agree with the other comments made regarding domain names and EBAY, in that there are mainly only crappy names available, which result in very low prices. The only names I sell there, are the stupid names I shouldn't have registered in the first place, in hopes of making back my reg fee and doing it before I let them expire. Sold a handful so far and will be trying again soon.
I would not attempt at selling any quality names there, as you'll get a bigger more focused audience in the various other domaining platforms out there, IMO.