There are, quite often, oddball sales. And my point was not to dissect an appraisal - god knows that happens on here quite often. In the example cited, though - and assuming the scenario has been presented accurately - the onus is on the appraiser to demonstrate why that sale sold above market. Not just to provide a flippant response that he won't use it because of his 30 years' experience.
My point was more that there are still a lot of appraisers who grew accustomed to the 'it's that way because I told you so' attitude - which worked for several decades, as the clients had no way to prove - or disprove - the appraiser's assertions. Not the case any longer. EVERYONE has all the data the appraiser does (for the most part).
AND - they've relied on that '30 years' experience' as basis for their adjustments (call it a cheat sheet if you will). Which has served only to cripple those appraisers - because now the users of our services are demanding quantitative analysis - something the '30 years' experience' folks don't know how to do.