It seems lot of people including us are running classifieds, even ebay run classifieds. So just thinking to run a auction site, not sure if people will add their items into a new auction site like mine. After all, adding products into a auction site is more troublesome than just post an ad listing in classifieds.
Personally I would use any auction site, as long as there was some kind of buyer and seller protection built in as well as a good selection of items, reasonable fees.
Our auction is a new and free auction site, it's glad to see the amount of products increasing daily.
I would use any site that gets me a good deal, of course. And that if some means of protection are in place. In case of any problem, eBay itself is offering a refund, so i feel secure.
If its in a specific niche I would consider it. As a general rule I find random auction sites to be pretty shady looking. Nigel