So, one day I am inspecting some comps from the street and as I had one that seemed low by 20% I had that in mind while inspecting said property. Sure enough I noticed light shining from between the bricks. As is typical when I get back from such I start my verification calls, with that odd-ball as the first on my list of calls. I inquire about condition and the RE agent says it is in "good" condition. I inform him I noticed it seemed to have sold for a bit below other comps and he informs me it was actually an estate sale. I mention seeing light between the bricks and get a long list of deferred maintenance.
That response is also my argument for calling rather than emailing, because I can "read" a person over the phone and listen to their hesitations to the questions I ask and thus what I may want to ask next.
Yep, I call agents. I ask them about specific properties, if they know of others that sold about the same time that they may have showed (especially buyer agents), and may even conduct impromptu polls about how much they believe a certain feature may contribute to value (not just cost, but contribution). I also ask about buyer & seller motivations (and will ask each agent in a transaction as to how motivated they think the other party was. Can't tell you how many times I found out the odd high sale was a person from out of state (who knew EXACTLY what they wanted) or was the neighbor buying for their kid or even the local power plant, or that the odd low sale was a hidden REO, estate sales, odd conditions, functional obsolescence, or that the owner's son was hit by a car and the rental tenant made unforgivable remarks to the owner about his son and he just wanted to be rid of the property.