They need to blame all of the various diet plans for people not eating popcorn.
Besides, I always eat popcorn when watching my pirated movies.
Hell, pirating full length movies is a waste of time. It's easier to run down the street (less than a mile) to Blockbuster. They frequently send me $1.99 coupons, and if I have the time to watch more than a couple movies in a given month, I can pay $25 for a movie pass.
Maybe people are going to the theatres less because a sucky rented movie can be fast forwarded through and costs less for both the movie and the snacks. Plus, considering the last few times I went to a theatre, my home sound system is far better and my TV has a clearer picture than the last few theatres I went to. Come to think of it, the last movie I saw in a theatre where the sound system impressed me was T2, and the system I have at home now would even beat that.
The only content of that nature I bother to download is TV shows that I've missed or weren't shown here and that aren't available for me to go rent (or buy at a reasonable price).