This seems more likely to be illegal. If it's not illegal, it's a similar issue to the current one and I would be inclined to allow it.
So does this mean that until someone can prove to your satisfaction that selling stolen credit card or other financial service credentials is illegal you will not ban posts offering those credentials for sale? People are looking for a yes/no answer here, not an "if, then" answer.
Yes or no. At this point in time - when you consider that it's "likely" the sale of stolen credit card credentials is illegal - will you allow people to offer credit card/PayPal/Dwolla/bank account/etc credentials for sale on the forums?