Today's field is only 40 cars of which 36 are guaranteed spots, leaving only 4 spots for other teams. Last weekend at Pocono they only had 38 cars in the field. When NASCAR started at the Brickyard, my wife and I went the first seven years. We had to enter a lottery the first year to get tickets and then had to pay for the next year the week after the race to keep our seats. This year you could have walked up to the ticket window on race day and bought prime seats. I'll bet there were fewer then 30,000 people there.
It used to be a week long event. You could come in on Wednesday and watch practice at the speedway then drive out to IRP and catch the sprint cars. Thursday was more practice and 1st round qualifying and then back out the IRP for the Truck race. Friday was second round qualifying, practice and for several years they had one of the IROC races, then back to IRP for the Busch series race that night. Saturday was the Brickyard 400. We would arrive early and park in the infield. We could be out of the track, have dinner at St. Elmos and be back in the hotel room to watch local broadcast of the race in the evening.
Four years ago NASCAR weekend hit at the end of Air Venture. We took the mighty Warrior and flew to Quincy, IL and spent the night with my best man and his wife. The next morning we flew to West Bend, WI and went to Air Venture and then flew down to Indy on Friday and the IMSA or whatever they were calling it then, Busch guys on Saturday, general admission tickets no reserved seats, and the Brickyard 400 on Sunday and flew back home on Monday. I bought seats under the shade behind the flag stand a week before the race.
It certainly has been downhill. I think you can even by tickets for Bristol now.