You won't stop people filming, there will always be some who think the policy doesn't apply to them for valid reasons in their eyes (I stand at the back so I don't disturb, I make beautiful DVDs and share them, I am filming for my 98 year old granny who couldn't make the show because she broke her leg rollerblading yesterday, etc). That's a shame because if the policy is not respected, they might decide to enforce it....
Now I'm off to buy a new video camera, any tips? I am going to film the next show I am attending. (The policy doesn't apply to me of course, I am the President!
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