There are innumerable number of eBay online sellers who maintain multiple eBay user accounts. Chances are you happen to be one of them. If so, you would know how hard it is on eBay to see data across all your eBay accounts. Not so hard on WonderLister. Right from day one, WonderLister was designed to support this need. You get the option to see all your listings and sales data for a selected eBay user ID or across all your eBay user IDs.