Different clubs use different regulations for Concours Competitions and it can vary widely.
The Meguiars NEC event is clearly focused on mega restored examples, and many of the viewing public do seem to enjoy seeing "pristine".
In the end, there is a slot for every taste. People get drawn into Concours, and it becomes super competitive, which is why clearly defined rules are essential, both for the entrant and the judges.
Without having experienced the pull, it's probably hard to see the attraction.
