90% of the pirate copies that usually come out within a film's first 6-8 weeks of release are usually of crap quality where it's just a guy video recording the theater screen. Those are the types most people will avoid because the the picture clarity and sound is too poor.
The ones that are out now for X-men and Civil War after 1-2 weeks of domestic release, are practically dvd quality. Piracy is a lot easier for people nowadays who own android phones. There are numerous piracy apps that are similar in design to netflix that allow people easily stream/download good quality versions of movies and tv shows for free. I work for a cell carrier, and I see tons of people, young and old, who have those types of apps on their phone when they come in for repairs. With devices like chromecast and apple tv, it's not hard to beam pirated content from one's phone to a tv set.
I don't know how you can ignore that this won't effect the box office. It might not be the most devastating that effects it, but it will chip away at the movies earnings.