WRT the above, appraisers need to understand certain things to retain our value contribution. MV is defined as the most probable price ( as developed in the appraisal ). However, the most probable price does mean a rote default to the average price. Most probable can be on the high end for a subject that is superior to most comps, the mid or average end when our subject is avg among comps, or the low end when the subject is inferior to many of the comps. The most probable price tends to be higher in a rising market and lower in a declining market as well. Defaulting to an average or a statistical mean is not how the RE market works, as we see from the range of prices and the various factors affecting prices (motivation, concessions, interest rates etc)
A market featuring bidding wars is going to produce the most probable price at a higher end than a market flooded with supply, showing list price reductions.