The Cinema used to do well during bad times here in Ireland, but as the cost of attending had increased considerably and many people have an extensive number of channels at home which are relatively cheap I can't see it being sustained.
Certainly in the US cinemas make more of their profit from the sale of food and drinks than from ticket sales. Not sure if it is the same here, but I would guess it is not too different.
People bringing in their own food in increasing numbers will hurt profitability.
Its the same. Ticket sales profits go to the film distributors. Food profits go to the bosses.
However. For every one person bringing in food, theres twenty that don't and instead buy their stuff at the concessions stand. Major profits to be had.