The answer is available to regular readers of Linn's Stamp News. Below is a quote from the "Linn's U.S.Graded Stamp Report : a quarterly feature that tracks the market activity for selected stamps in eight grades" report in Linn's dated 08/17/2017:
"At no time since we have been tracking these stamps have so many stamps in the grade of Very Fine-80 (the Scott catalog benchmark value shown in the other sections of this catalog) seen so many decreases in value. We could have stuck our heads in the sand and ignored the obvious, but our duty is to report marketplace reality, and this we have done. We hope all interested parties can see the positive in the catalog reporting valid information and how refusing to do so would not be helpful to anyone."
The article goes on to explain that prices for very highly grades stamps (95 and better) continue to be strong while grade 85 and 90 stamps are not keeping up.
In my opinion, very fine (grade 80) stamps continue to be underpriced because too many dealers over grade fine or fine to very fine stamps as very fine, diluting the quality of the reporting Scott receives. I also believe that the price difference between very fine stamps and lesser grades is growing. Off center or damaged stamps sell at a small fraction of the price of sound well centered stamps. The percentage continues to get smaller.
Price information is available, but it is not free. I would not expect to find it on this board. But, it is possible to scan the web and see the prices of stamps that have not sold (yet) or check sold listings on
ebay.