I disagree and I'm going to stand by my assertion. The real estate purchase is an emotional one, A hurried one, A desperate one. There's no way that anyone on this forum can "pinpoint" at any point in time the "exact value" of what a home price should be.
Does that mean appraisers shouldn't be used? Of course not. We follow (okay, some follow) well documented methodology that leads to the most probable price as of the effective date of value that falls within an adjusted range. Basically, an educated guess as to the price the real estate would fetch in a free market. Doctors do this too by the way. Medical science is not an exact science. They are using their best educated guess based on the patient's symptoms.
Ale's post in this thread illustrates my point.
Which value of the property is correct? Is it exactly $750k or is exactly 950k? I doubt either. But one of them is within the range of the most similar sales as of the effective date.