Tom Wells said:
Nascar was once actual vehicles that came down the same production line as a car you could buy.
Richard Petty tells the story of his dad, Lee, driving his car to the race track, running the race, then driving it home. He said more than once they had to spend some additional time at the track after the race putting the car back together.
Tom Wells said:
There were always "special" and heavy duty parts, but these were available on production vehicles.
All that began changing in the 60's with the introduction of more sophisticated safety equipment and specialty parts and engine makers like Holman-Moody. When factory participation was still popular you could buy some parts through their respective racing divisions but most could not be ordered from an assembly line configuration.
Tom Wells said:
Now that there isn't anything in these vehicles that makes them equivalent in any way to production vehicles, it's a lot less interesting to many people.
While it's true the old Ford vs Chevy vs Mopar competition hasn't been heard in the stands like it used to be it is still true in the pits. Of course the factories don't participate in NASCAR like they used to do because racing isn't the purchase driver it used to be. About the only production item on the race cars these days is the front grill and other than that they are full blown race vehicles which bear no resemblance to production cars.
I'm not so sure it is the design of the race car itself that isn't interesting to most people but rather that the cars are so close in performance things like aero packages and drafting tend to make the race more like a basketball game. Although the races tend to be closer at the finish than ever before it is largely through the frequent throwing of the yellow that bunches them up throughout the race. The myriad of penalties a driver can obtain (with speeding in the pits being the most unnecessary and unfortunate) tends to remove marquee drivers from competition and displease fans.
Adding to on-track problems was the Great Recession and by the looks of empty seats this year the racing industry hasn't yet recovered. The IndyCar race at Texas yesterday was pitiful in the number of empty seats so it isn't just NASCAR.
I've been watching NASCAR racing since 1970 but these days I am usually doing something else while listening to it and will pay attention only if something significant happens. The restrictor plates have ruined the big tracks and the little bull rings are too small for 43 big race cars. That leaves the mile and 1.5-mile tracks that look and race pretty much the same. Boring! My two favorite races these days are Watkins Glen and Sonoma road tracks.