I go to these shows because its nice to get out in the Maro and have a proper destination in mind rather than just going for 'a drive'. Much as I enjoy looking at Yanks parked up anywhere I agree with Nige about seeing and hearing them being driven, that's why I usually sit on the grass with a coffee and watch the cars arriving on the road leading into Billing before I go in.
I have only ever been interested in the cars, I have no interest in Country and Western music or dressing up as a cowboy, college student or a policeman, I have no desire to be American or to pretend to be American so a lot of the stuff that go's on at some of these shows is lost on me, I go to see the cars. But hey, each to their own pleasure! everyone is different and that's what makes the world go round.