We aren't allow to list co-ops as condos. In fact, our local boards and MLS's can fine us if we improperly list property types. Unfortunately, when 3rd Party services, such as Trulia, Zillow and other home sites pull the information from our MLS's, they don't always have the tools to designate which property is a co-op and which is a condo. So, to answer your question, I wouldn't say we are eroding our reputations, but rather the sites that take our information are the ones misinforming you.
Your best bet is to work with a local Realtor to get the most up to take available property list.
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Trulia is a great site for consumers to use, but be aware that when you need to validate information, your best source is going to be a REALTOR. Find a good one!
Most of the time, the listings feed from MLS's or a syndication feed. The listing classification is grouped as one (condo, co-op & town home). Agents can't micro-classify, even though it would be easier. It's a hassle for agents as well.
The thing to do would be for agents to include in the comments when a property is condo or co-op to better delineate the listings for consumers.
So, I agree with you on the inconvenience angle. But, I don't think it's done with any malice or just to make the phone ring.
But, yes...it's annoying. Good call! Let's fix that glitch!