How can it be this hard to get a clear idea of Supercars crowd numbers?

Supercars in action in Newcastle earlier this month. Picture by Marina Neil

Last Sunday afternoon more than 15,000 people watched the Newcastle Knights post a gutsy, come-from-behind win against the Canberra Raiders at McDonald Jones Stadium.

We know that 15,106 people attended the match because that's how many passed through the turnstiles and scanned a ticket.