Adjusted for inflation, actor and actress salaries have been increasing over the decades. Adjusted for inflation, movie ticket prices have been increasing over the decades.
In the 2000's, with far more entertainment options to choose from, and movies being relatively more expensive compared to their cost to consumers as a percent of salary in the past, is it any wonder that eventually consumers choose to spend their money elsewhere? Add on the lack of creativity, some consumers are probably starting to get bored with all the remakes.
Now, on top of the (adjusted for inflation) ticket prices that have been going up, you have the FAR outpacing inflation costs for those other things that add to the movie experience - popcorn, soda, etc. I've stopped going to theaters for a variety of reasons. First - I don't believe your "we have to charge so much because we don't make money on the tickets." What? $40 (including popcorn and soda for 2) You've alienated me as a customer & it'll take quite a bit to get me back. Second, so many of the movies are crap. Third, I've got a large screen TV & can rent a movie for just a couple bucks, or stick to avenues such as Netflix, Prime, etc. Sure, I don't get all the new releases, but there's plenty to watch, and I don't feel cheated if I turn the movie off half way through because it sucks. Oh, and 4th, most of the theaters don't give a shit about obnoxious customers. Weird that back when minimum wage was twice the cost of a movie, they were able to afford an usher to take care of disruptive people in the audience. I'm not getting up in the middle of a movie, leaving to go complain, and missing part of the movie as a result - I'll just grumble through it & leave having had a poor experience.