Inform yourself, idiot.Zillow and Trulia make their revenues FROM realtors wth are you smoking
NAR and realtor.com operator Move Inc. file suit against Zillow, Errol Samuelson
Redfin study: Trulia and Zillow lack listings and show out-of-date information
Realtors Push Back Against Zillow and MLS Listing Syndicators
Most of Zillow's revenue comes from consumer advertising. They make some via realtor/broker advertising, but I doubt that it's enough to offset the litigation/payments made to get super out of date MLS information.