I have had a few friends that raced open wheeled cars. 500+- Hp v8, a type of sprint car but not as fast. On several occasions i helped out in the pits when asked.
I went to Daytona for the 400 mile race in July once. I left after 20 laps. The price on the ticket was 275$ and this was 15 years ago. I did not enjoy NASCAR, doesn't hold my attention.
It seems to me the guys that like to race have been in it or generations. It's not something you just jump into. It's a significant investment of time and money. You have to really love it. The guys I raced with were truly addicted, spent every dime and every minute either working on the car, getting ready and to the track, or racing.