this has been asked before. i believe the Admins' response was that the iTrader system (good as it was) strained the server resources so much so that it created a lot of bugs and crashes. bearing in mind that our servers had just gone through a catastrophic hardware and database failure not too long ago, i think Admins will be hesitant to bring it back.
NW, fair enough.
I guess the other option for CSers which won't overload the server is to create a "hall of shame" thread in Consumers Corner to name the bad sellers and warn other CSers.