Hi Frank, thanks for the link, I was not aware of siteanalytics.complete.com.
It is an uphill battle to find a viable market place that is not ebay, although, the powersellersunite site does show, from the seller's perspective there appears to be value listing on other sites (looking at the trends, including sites that have no seller's fees). Another tool would be Link hidden: Login to view, just plug in the other sites for comparison.