Here’s the thing. Even with inflation (which is exaggerated by companies when they jack up prices for consumers), they have less overhead now than they did when they started. They had to do all the DVD stuff by hand and now it’s all computers. So basically they just had a massive bump in their profit margins and just pocketed the difference.
Surprise surprise, better technology and automation replacing people doesn’t mean things become cheaper under capitalism, even when it fucking should.