For those that don't understand the reasons here they are.
Going to the cinema is a night out.
Wanking off to a porn movie is 20 minutes. And you don't need to get dressed or take a friend.
The movie industry create a product and experience the consumer is willing to pay for.
The porn industry largely isn't doing the same. And thinks giving more away for free will solve the problem.
The movie industry has professional marketing personnel.
We have Damian. 
Never paid for a movie ticket and walked into anything but a place that showed movies or tried to charge me over and over again. Also I got the real thing, not a con.
We think ripping off customers is a good way to get rich. From checked boxes on cross sells to sending them to dating sites with few or no chance of the guy getting a date.
This industry is great at deluding itself. Movies sell more so porn should. People buy bottled water when it's available for free. So they will pay for porn. Anything to continue the delusion and deny revenues are dropping.