Drdrowsy - regarding your comment:
"claiming he did the best he could. I would think that a desire to have pride in ones work would compel someone to make corrections, but that doesn't appear to be the case. "
I suspect that often appraisers do want to do their jobs correctly, and most of them have a lot of pride in their work. However, the issue is, is that for the most part lenders are stuck using Appraisal Management Company's (AMC's), these are the company's that Scott Hulen referred to as taking a slice of the appraiser's pie/profit. Well you see when one of these requests to change an appraisal is made, it goes through the AMC's first, then to the appraiser. So there is a bit of a political mess here. The AMC doesn't want to look incompetent for not doing a thorough Quality Control (QC) review or they may not be used by the lender, the appraiser doesn't want to look incompetent for not doing a quality appraisal or they may not be used by the AMC. So admit the mistake by making the correction? Or stick to your guns and justify that the appraisal was done "the right way"? Most pick the latter.