One of the best instructors I ever had - took some 5 courses from him including the pre-test prep, Marshal & Swift, narrative writing, and a great 12C course - was, by all counts, an incompetent appraiser himself. He taught for NAMA for a while then set up his own school. He would take on trainees who attended his class and supervision was minimal. Reviewing even less so, apparently delegated to another trainee or his secretary. I think it was the lure of money as he had a huge residential appraisal business. At some point, so many of his trainee's reports ended up before the state board they were going to sanction him. He resigned his license. He had 2 separate state licenses and a second home in that state, so he moved back and set up shop there.
He asked another appraiser - now in his 80s - to help him generate some work. This Tulsa appraiser was a former president of NAIFA many years before, a dedicated life-long appraiser as is his son. He personally told me that " J. D. couldn't appraise his way out of a paper bag.." or some such language to that effect. He tried to help him but quickly severed the relationship. His judgment was simply not good. It is hard to understand when you took classes from what appeared to be a class act - absolutely the best instructor on the 12 C I've ever seen -
Another case was another NAIFIA past president and instructor that a CG trainee of mine worked with for a while. He said despite the old guy calling himself an appraiser, he was confident that this "pro" had not completed a URAR in 10 years or longer. He simply signed off on what others did, usually with little oversight. He, too, took on students as trainees to get their hours. Often the state was calling on him to review the applications of his own students....duh.