The employee was obviously on a 'say what I want to hear' power trip.
She simply asked why it was considered a big camera. My wife did stop using the camera after she was told that it wasn't allowed. The casino employee (who was rude as hell) threatened to ask my wife to leave if she wouldn't comply with the camera policy. My wife asked how it was classified as a big camera. She said that it was disallowed because it was a 'big' camera. As my wife was snapping photos of the concert some lady that looked like she might have been a member of management raised a stink about the camera. That person said nothing about a camera policy. As my wife and I had our tickets scanned while we were entering the venue the person scanning the tickets clearly saw that we had a camera. If the casino really did have a policy about certain cameras being disallowed they obviously did a lousy job of making it known in advance. So basically there was no policy listed anywhere about the use of cameras inside the concert venue. The casino's website had no policy listed about cameras. Our tickets that we printed off the internet didn't mention any policy regarding camera use. The sign said nothing about photography cameras.
First of all the sign outside the concert room said that no video or audio recordings were allowed. The staff made a big deal about the camera my wife was using (Canon EOS Rebel T3i). My wife and I attended the Willie Nelson concert on August 8, 2014.