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>older stuff draws less than newer stuff
Just simple recency bias
For example: Antonio Inoki
If he had died even 10 years ago, there would've been multiple days of national mourning. 15-20? Without a doubt.
But the sad fact is that Antonio Inoki outlived many of his fans and the high point of his fame was so far in the past that it diminished the reaction.
Same goes for Punk.