I finally got a reply from someone at the RAS as follows:
Please be assured it is not our intention for amateur photographers to
be restricted from taking photos around the Showground during the Sydney
Royal Easter Show.
I have advice from our Legal department that amateur photographers are
free to take photos at the Show, providing that:-
1) the photographer is not causing annoyance or inconvenience to other
show patrons;
2) that the photos subject is not one detailed in the Summary Offences
Act 1988 (NSW) ;
3) the subjects have given their consent (if under 18 then their parents
consent); and
4) that the photos are not to be sold for commercial gain.
For further reading, please refer to a publication called 'Street
Photographers Rights' - information published by the Arts Law Centre of
Australia in conjunction with the Federal Government. It covers many
issues that may be relevant to amateur photographers.
I hope this clears up any misunderstandings. Unfortunately any power hungry person with a flouro vest that doesn't like the way you look will wave a copy of the T & C in your face and try to take your camera off you. When you resist the nearest policeman will arrest you for an affray.
Anyone seen Anger Management at the movies, it's not so far from the truth. Also any parent who assumes that you might possibly inadvertently include their children in the tiniest corner of a photo will scream peadophile and holler for the nearest policeman.
I guess it's the definition of an 'Amateur Photographer' that is open to interpretation. Even though I don't shoot professionally any more, when I try to walk through the gate with a Nikon D3 hanging off the back of a Sigma 300-800 I wouldn't even get in. I would probably get arrested as a potential terrorist (everyone knows that terrorists always use big obvious camera's).
You should also be considered professional with a medium format camera but it has been my observation that only people with digital camera's and fast lenses get targeted.
You need at least a 400mm at the wood chop to get anything decent. It will probably be one of the last few years that David and Stephen Foster compete together with a chance to take out the titles.
If you go for a walk through any museum, most of the photo's have been donated by amateur photographers or their families.
Oh, and by the way, don't talk to anyone who may be a outlaw bikie as you may get arrested too. Will this one day be the case for camera clubs when the government decides that some member took an embarrassing photo of a politician.
Some interesting reading here.
http://www.4020.net/words/photorights.php