I didn't know but I think it's a good idea.I have so many non paying bidders. The 2 weeks or so I have to go through the process of reporting the non payment. Waiting to relist an item. To not be able to warn other seller of their non payment is ridiculous. Ebay doesn't present any warnings to us that they have had say 2 NPB's before you did business with them.
I see a lot of auction sites and i t might take a while for one of them to take off. In the mean time what to do for paying bills.