At the risk of sounding foolish, there is some truth to "keeping at it." Check out airBnB's talk startup school; you guys seem to be in a similar place as they

At the risk of sounding foolish, there is some truth to "keeping at it." Check out airBnB's talk startup school; you guys seem to be in a similar place as they were a year or so ago. According to you, you're nearly complete with development, and marketing is your biggest expense. That's better than some situations (no cash, no products either). Marketing is the easiest thing to reduce in expenses. The most powerful tools in your marketing arsenal are handshakes, telephones and business cards. Go to small groups for face-to-face conferences with potential users, and take your current users out for a series of lunches/beers. Contribute as much as possible to the user generated content of the site itself. If it is a form of web2.0 for traders, you and the rest of the team should post things several times a day - the site may become much richer because of it.