I have a ticket stub in my basement from when I saw Nine Inch Nails and A Perfect Circle for $40, so I definitely remember. I went to a ton of concert when I was younger making a fraction of what I make now.
This was the concert they played for their induction into the Rock & Roll Hall of Fame. It also included past members of the band. It was a very in-demand show and not a 'headlining at the county fair/local casino' show.
I mean, there's a drastic difference in cultural relevance over those 20 years. 2000 was at the tail end of their peak. Supply/demand would certainly affect the equation.