It does have an effect, but so does pricing like people on here have said.
I used to go to my local cinema every single week when it was like £2-3 for a ticket. And the food was cheap there.
Now I'm lucky if I can afford to go once a month- the small local one closed down. Of course, I'm a student so not that representative. But I can't imagine how families manage, it would be easy to spend like £40-50 just to take your kids and get them all a drink. So whether or not they pirate, it stops them going.