Stone- could be that I did miss Greg's point, but my point is that it does not matter where it came from, it's in USPAP now. Also it does not matter that it is a fact that such data is extremely important to have as part of any credibel appraisal. The point is that any rule making entity should be be aware of and consider the effects of any rule before making that rule. Things like---is such information readily available and if not how available is it, what sources are available for that information and how reliable might it be etc etc.... Then once that analyses is done if the rule is deemed to be that important even though the data it requires may not be obtainable, it is incumbant upon the rule-maker to develop as concise as possible ways one is to proceed in terms of the level of efforts one must make to obtain the info. Not the "normal course of business" or the what do your peers do" esoteric crap that was developed. Normal course of business and what your peers do can be darned near anything depending on where your at. IMHO it is merely language that is used because of failure to develop meaningful standards or just plain language to use as a gotcha if they feel like you did not meet the minimum requirements.
If those that regulate us want us to carefully and professionally analyze what we do, then I expect the same from them!