Counterfeit currency is a restricted item on the road, and every person attempting to offer it so far has been a scammer. If you notice counterfeit currency being offered for sale, please report it to Silk Road by clicking the 'report this item' link on the item page, or the 'report this vendor' link on the vendor page. As far as vendors offering legitimate currency goes, most do it for others who wish to cash out, though it's a fairly risky way of turning Bitcoin into cash and virtually no vendors do this. Libertas