It's always Good to Know what to Expect in the Future regarding the FREE model.

Looks like they'll have a paid model for certain usage levels But more towards high-volume sellers...

Start-up Plans to Streamline Classified Ad Creation...
The business model is two-fold, Muoto explained. The service is free today but the company plans to charge a subscription fee for power sellers. “We’ll have a paid model for certain usage levels and for high-volume users in certain vertical markets. For those users, we’ll provide enhanced services like custom galleries and the ability to use their own logo [on the virtual flyer],” he added.
http://clickz.com/showPage.html?page=3623590

Wanted: A Way to Profit by Simplifying Web Classifieds...
http://www.nytimes.com/2006/10/02/te...ref=technology

Phil