almost everyone who pirates a movie wont watch it in theater especially if there willing to watch the eye torture that is a cam version.
also who wants to watch a movie in the theater especially with how they try to rip you off, they already overcharge for the tickets and then on top of that they force you to not bring your own food and drinks, so you can buy their crap thats easily 7-15 times more expensive. then while in the place theres like 20 minutes worth of ads before the movie starts, then during the movie theres noise people, tall people who sit in front of you, people who get up every 5 minutes. people who bring little kids in, the are restrictions are there for movie to stop little kids from coming in and being noisy and holding side conversations instead of watching the movie.
I much rather rent the movie for a fraction of the cost and enjoy it in front of a HDTV and surround sound, and have the ability to pause and also offer better sound quality and fewer distractions.
also most pirated movies are from other countries especially if a movie is not released everywhere at 1 time
same as with games, the reason why game companies cant do much about it is because there too stupid to know how to release a game everywhere at the same time, most American games that are pirated, most of the pirates are in other countries that didn't get the game yet (many will still buy the game to use all of it's features and others wont buy it and delete it because they find that the game sucks)
they always flew each download or make up a number and count it as a lost sale even though they cant prove that those people wouldn't have paid to see the movie anyway.
another problem movies suck now, even though they are expensive and have better special effects, they feel cheaper and less thought out because the only reason why they are expensive is because they hire big name actors because they feel that just their name is enough to generate hype. other companies have proved that not hiring big name actors can still get you excellent acting while at the same time cost a fraction of the amount to make.
also most action films generally lack action, there more talking and what you see in the trailer is generally all the action you get (just slightly longer)
movies disappoint so much these days and the trailers are not accurate there only designed to generate hype, because of all of this disappointment many people are more likely to pirate them and then watch in theater if they really enjoyed it and want to watch again. movie reviews are not accurate either because like and dislike is different for everyone on earth, some may find a movie that got a 1/10 rating great while others may hate it.
if movies in theater were cheaper like $1-2, everyone would go more often and will even watch multiple movies.
would you rather have 20 people buy your product at $10 or 15000 people buy your product at $1?