I think J is probably allowing herself to be used as an example of folks who haven't quite come to grips with the difference between 'market value' and an 'opinion of market value'. Market value is an abstract concept that examines a property's worth as valued by 'the market'. Of course, 'the market' is - in and of itself - an abstract concept as well. We use the term 'most probable price' (along with a number of modifiers) as that is easy enough to understand, but vague enough not to pin the concept down. And even if a property DOES settle - between parties who fit the definition of market value - is that sale price the 'true' value of the property? Remember the old adage, "One sale does not a market make."?
Then we ask trained professionals to give their 'opinion' of what the market value MIGHT be. Of course we have quantitative and qualitative tools at our disposal to assist us in that pursuit, bat at the end of the day - our OMV (or EMV) is nothing more, or less, than a well supported (hopefully) OPINION. Were 10 appraisers to render valuation services on the same property, with the same effective date, we would most likely see 10 different results - ALL of which COULD be well supported. It should be easy to grasp, then, that the concept of a 'point value' as it relates to real property, is NOT reflective of the property's true value, but is simply an opinion, constrained by the needs of the users to be distilled into one point. On a theoretical basis, however, even that one point is - in reality - a range. If I call a property $500,000, I've effectively said the property is worth between $499,999.51 and $500,000.49. If we can agree that is the case, then we are in agreement properties will ALWAYS exhibit a range of value - and the more reliable and prolific the data - the tighter the range.