Agree.
I think if you are racing Regionals and Nationals level then you should have a pretty good supply of kit.
Shops are great at tracks and they cant carry everythnig for every car, amazes me how ill prepared people are!.
If I'm travelling 60 miels+ to a meeting I want to have every conceivable spare part that might 'go' during the day - otherwise its a day wasted with frustration and disapointment.
Knowing my luck though, the ONE item I dont have will break