The service recommends that you find the lowest advance-purchase fare and then bid it. Usually, the airline will cull its inventory of distressed seats that would go unused and lets you have it at the cut rate. There's just one problem. You have to wait for the service to go through the motions. Preview Travel dangles advertisements in front of your nose before coughing up a fare.
People lose interest and move on.
But I trust travel agents about as much as I do any beta version of a Microsoft browser. Booking travel in cyberspace may take time. And I think more time is exactly what it needs before the Internet can become the electronic travel agent it promises to be. Give this business a few more years. After all, at this point in their development, travel agents were still writing tickets by hand.