Calculation grades and grade inflation

It is nice to see how well the grading system works around the globe and that we have a slow but steady grade inflation is just natural. One of the reason for this is the calculation grading that some topo authors as well as websites use. Let us say twelve guys do and report a 9a and then three guys come along suggest 8c+. The calculated grade would still be 9a although it just might be that most of the first repeaters did actually not suggest 9a. Instead they just used the topo grade, as they do not care, or possibly wanted to make the first ascentionists and the sponsors pleased. Other possible reasons for the 8c+ suggestions, might be that a new sequence was found or a hold broke making it easier. In practice, trying to calculate grade, a higher weight should be given to the last suggestions otherwise the multiplication sum just might continue the grade inflation.