I stopped going sometime mid-2000s, not because of the cost or the quality of movies, but because of the quality of my fellow movie watchers, who were pretty awful to be honest (at least in Silicon Valley at the time):

- Lord of the Rings: a family came in after the movie started with a cluster of helium balloons, each of which eventually got loose and floated around the theatre. A small balloon creates an outsized shadow on the screen when it floats in front of the projector (e.g., sometimes a third of the picture would disappear).

- A Beautiful Mind: Several guys, in different spots in the theatre, would wait for a quiet moment in the movie and say loudly "Oh my beautiful mind". One guy had a squeaky seat, so each time he said his bit, he would squeak his chair 5 times.

- Panic Room: Two people directly behind us just laughed hysterically at seemingly every line in the movie.

Also, the advertisements went on too long (20 minutes maybe?) and were also rock-concert loud.

Last night, I watched Wolfs (Apple TV) in my living room with my spouse and we enjoyed it. It's not a great movie, but it's good, there are no ear-splitting advertisements, and the audience is well behaved.

Edit: Later in the 2000s I did see a few Coen brothers films in the theatre, and those were good experiences, but I still avoided the theatre for the most part.