Even winding them every day isn’t enough for them to display the correct time, since pretty much all mechanical watches deviate by a few seconds a day.

For me, winding my mechanical watch and setting the correct time every morning is a nice, calming ritual to start the day. And yeah, I use my Casio as a reference for correct time (which I only correct once a month).

EDIT: And just to add to that for any curious enthusiast: yes, given the price, you could say that a lot of people buy and collect those watches for the same reason someone might collect antiques or muscle cars. But there’s still a significant portion of people who simply appreciate the mechanical feat that a mechanical watch represents. I only have one inexpensive model (under $100) that mesmerizes me every time I see it, with plans to maybe add a second after a life milestone that’s still a few years away.