Originally Posted by Black Sun

Why should you care?

I go to concerts that allow BYOB, and they sell beer at concession stands..
I go to movie theatres that allow personal snacks brought in, that they sell at concession stands.

Can't expect to enforce a rule that I don't follow

Try to put a stop to it, and you will see your customer base dwindle..because someone (competitor) out there is thinking out of the box.