I have just put up a lot of 10 x 5 letter domain names on ebay starting bid $40 each and 5 two word domain names, go to raredn.com to view the auctions (raredn.com directly goes to my auctions on ebay). If the majority of them sell, then ebay is good, if not then there are better places to sell domains, like on namepros forums here and also doing the legwork, finding end users to get the top of the line prices you are aiming for.
Consistency is good, if you can get steady sales without dry spells