I am not 100% sure about this but I think they find someone who has just purchased a house/condo and they go around comparing similar properties in the same price range and see if the folks who already bought got screwed or not.
They look at 3 properties in an area they usually vacation in or want to live in, look at the properties, compare what they like or don't like about the properties, then they pick the one they like the best...
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