I sont see how showing, judging, or riding, and especially a 4 day class that's only pass requirement is, "the check cleared". Really has anythign to do with making someone a competent appraiser.
Appraisals are about market value, I imagine a sale barn or guy that runs a horse auction would no more about that.
I think a substantial background in horses has everything to do with it.. most valued opinions in the horse industry come those backed by a successful career in breeding, selling, training, showing, judging. Backed by a foundation of success is proof of their skill at what they know. Horses.
If I were to say have a QH... And had a choice between the judge from congress the year prior to me selling the horse who has been breeding a successful program for twenty years and the guy running an auction? Congress Judge please. A judge can tell you the good and bad. I feel like an auction or sales handler would promote positive attributes without mentioning, but not lying about, flaws.
*not saying all sales/auction people are shady but they have a job. Just a personal preference or opinion for me.. :)