For a lot of real estate websites, the majority of landing pages are simply listing pages that have been indexed by search engines. This provides a great many entry points into the site.  However, since MLS data is shared with every other website on that MLS feed, including big players such as Trulia, Zillow and Homes.com, the competition for visibility is high. Sellers want to get as many people viewing their property as possible so that it will sell. This puts agents and brokers under pressure for good search rankings, where the majority of people begin their property search.