Cool site. However why did you choose USD as the default currency? Why not bitcoin? I know you guys accept bitcoin but it should be the currency you see on the main page. Just my opinion. Still a cool site and I think I'll be trying it out soon 
One of the ideas was to offer buyers stable and unchangeable price. Bitcoin value is permanently changes. It is good both for sellers and buyers - buyers won't overpay but sellers won't loose money if bitcoin value falls. At present time sellers agreed with us. If for some of the seller will be in principle to sell in bitcoins - we will post listing in bitcoins.