From reviewing your profile I am unable to determine how long you have been a real estate professional. This makes it a bit difficult to know where to begin.
Trulia is an aggregate website that displays data from a large assortment of sources. If the website does not display the smiling face of a real estate professional, display the Realtor (r) trademark or does not display a real estate related brand, it is an aggregate website.
A common practice of websites of this nature is to STRIP the displayed information of any reference to the real estate agent. The business model is to sell the real estate agent a service that allows their contact data to be restored. Yeah, you got it. The real estate agent collected the data, took the images, wrote the description and their authorship has been stripped. Welcome to real estate! As an agent you are in everyones food chain. It is also important to note, there is no real chain of accountability regarding the accuracy or how outdated the displayed data may be. The active home buyer and seller may be in need of reliable data. All you can do is make it work in your favor as much as possible and hold very tightly to your hard earned money.
But back to Zac's questions, "Why is the listing agent contact data missing?"
Consider the agent is unaware their listing has been posted on aggregate websites like the following:
Trulia,Yahoo, Aol, Zillow, Frontdoor, Homescape, Cyberhomes, hotpads, Cribs, Vast, CLR, Oodle, Propbot, Local, backpage, Lycos, Military.com, Landwatch, Resortscape, lakehomes, Enormo, Myrealty, walmart, homes&land, homesearch, Kdat, turnto23, whiotv.com. Click2Huston, MSN, Compuserve, DigitalCity, iwon, Juno, netscape, the wallstreetJournal, Chicago Sun-Times, TampabayOnline (tbo), Moving.com, WorldPropereties, Prudential, GMAC (This is but a molecule of the total list which is nearly endless, but I think the point has been made.)
Each and everyone of these sites will have stripped the listing agent contact data. It isn't that an agent doesn't get it. IT IS that these sites take agent generated data, display this data without an agents knowledge or permission.
How much time do you think an agent would have available to show homes to excited buyers if they were preoccupied correcting the data these sites have trolled off the internet and display to the public as their data.
The good news should be that the agents broker name and contact data is presented. This may or may not be true. With so many of these sites, I certainly can not state with certainty what they display. Yes, it complicates the process, and in most cases (not ReMax Realtec Group) calling the broker becomes a incredibly expensive situation for the listing agent if the broker applies a referral fee to a call generated by a frustrated buyer.
It isn't that agents don't get it!
One might be well advised to ask, "Where does the extortion stop?" Real Estate agents are in everyone's food chain from Realtor.com to URIdiotscom Thinking strategically, an agent needs to realize who are the big players, the websites every home buyer will turn to, what sites benefit the homeseller and the agent most and invest there. That may not be Trulia.
Zac, as a new agent, you have had the good fortune to experience what many home shoppers are confronted with. Know how to articulate this delima then provide for them a solution. Then the world begins to make more sense and you will have added value to the home buying process for some buyers who will be grateful for your intervention.
Trulia allows agents to sign up for free and ad their information. And you can pay for an "enhanced" listing. However many agents just do not "get" the power of the Internet and don't take advantage of some of the great opportunities out there.