Nascar continues to take out seats to "look" like full stands. I just saw a story the other day on that very subject. Daytona "sold out" last year, but over 45,000 seats were removed between the 2017 and 2018 500's, now 101,000 seats from 146,000. Some other ISC (Nascar) owned tracks and seat comparison;
Nascar and TV are not looking good either. Last year almost every race was down on ratings and viewership. It doesn't help that over half the races are not on broadcast TV, either on FS1 or NBCSN - Everybody does not have cable as the NFL and NFL Network has found out.