Good luck pleasing everyone!
The first mistake is trying to please anyone but yourself.
It's not about the choices of cars or tracks its about attracting the right people and enough of them, once you have people they will drive whatever you put in front of them. People will always moan about everything under the sun, you simply ignore all of it and do you're own thing. Once you realise there is no pleasing anyone, let alone everyone, and therefore the best thing to do is please yourself then the job is a lot easier. Let people moan, it's fine, just ignore it.
Thanks for your time and commitment to organising the events, people do appreciate it (even if they don't show it very well).