These sort of websites that group photographers together for potential customers; often are pitted against one another where the winner is usually the one with the lowest pricing.
Clients go to these web sites for quick information and pricing and more often than not you are only going to attract "bottom feeders". Now, if you happen to be a volume type studio or amateur looking to make a few extra pennies on the side then this web site might be worth something to consider. However, if you are a boutique studio or a photographer with solid credentials looking for higher end clients with disposable income, then I would just pass right over this site.