Popcorn, specifically. I used to go to our local theater for the popcorn. They have a ticket plus large popcorn and drink for $9, it’s a great deal. Then I figured out how to make my own popcorn that tastes just like the theater stuff with ghee and fine salt, so now I’m more inclined to just stay home and make my own.
Still gotta do the drive-in at least once a year, though.
Sometimes, it’s because they’ve lost the source code. Perfect example is Panzer Dragoon Saga. SEGA would love to remaster it, but the original source is gone, and it’s apparently too financially risky to invest in rewriting from scratch.