I think a lot of people have gotten upset about this. The thing is a grand final in 1953 is really only majorly significant to a small percentage of the population.I appreciate the effort, and yes, it is all arbitrary. I think I prefer you're first table though... I see a flag won 10 years ago being worth closer to 16% of a current flag than 70%.
I firmly believe that the most recent premiership will always hold more power.