Theres a couple good videos that talk about the decline of NASCAR by EmpLemon https://www.youtube.com/watch?v=7RjAWFDL3fA https://www.youtube.com/watch?v=IxTAJNifDAI
From what I remember, it boils down to the fact they added regulations to make the races safer, which also made them more boring as there were less crashes, less speed, and overall less danger.
piracy prevails