Actually, I don't think "everyone " understands it....I think the reverse, that some appraisers believe the definition of MV literally is the appraisal. Just read the posts, esp early in thread where the content is about how to justify the builder's price increase. Now, the subject MVO may match or exceed the price increase. Or it might not . But the point is, they start out assuming it is worth the price because a buyer paid it, and working off that assumption, search for ways to support that ( the pendings from same builder ). That becomes appraising to a predetermined value,. .
The MV definition does not literally equate its price as a "market value" $ amount, " it's purpose, as you state, is to provide the TYPE OF VALUE (as defined ), for the appraisal opinion of market value