From the Syndication To Real Estate portals PDF paper from Clariety Consulting after showing examples of Trulia, Zillow, and Yahoo! promoting other agents over the listing agent on listing detail pages:

Trulia, YAHOO!, Zillow and others would claim that their ad treatments are no different from the standard industry practices of “cooperation and compensation” and IDX display, where someone other than the listing broker works with a buyer and where competing brokers advertise the listing broker’s properties. However, as noted above, closer examination suggests that consumers often are not aware that their inquiries are being directed to someone other than the listing agent. And the user experiences on these sites often actively disadvantage the listing agents. Moreover, the IDX infrastructure is specifically designed to help brokers provide permission for their counterparts to advertise their listings (with prominent attribution for the listing broker). Many publishers would be hard pressed to argue that the listing brokers have knowingly granted permission for third-parties to advertise and capture leads on their listings, and the treatments on Trulia, YAHOO!, and Zillow are in no way comparable to typical IDX display rules.

In my mind, there is no question that IDX results in the same confusion regarding who the listing agent is that Z/T/YRE has. Ask Jay Thompson or Kris Berg how many phone calls they field from buyers who find their websites as a result of address searches for a particular property they are interested in and have no clue that they are not calling the listing agent. The answer is “a lot”.

In any case, I don’t know why this is such an issue. Last I checked, the goal of listing agents was to sell their listings — no? Why does it matter who the buyer contacts once they find the home? In many cases, it’s NOT in a buyer’s best interests to contact the listing agent in any case. A listing agent has a vested interest in selling them THAT home. A buyer’s agent has a vested interest in selling the buyer a home that’s right for them. At least, in theory.

Would buyer’s agent rather not pay for leads? Sure. But is that reasonable to expect? No. Finding business comes down to time or money. You can either invest the time yourself over an extended period of time to build your network & book of business, or you can pay money to other’s who already have significant reach to bypass or speed up finding clients. It’s a pretty simple equation.