Some people mine because they believe in a coin and in that case it might be worth it in the long run.
e.g. it was worth it half a year ago when I mined ethereum and monero because they went up a lot.
If a coin I mine does not go up (I simply mine with a few GPUs) then it is often not worth it
to me (in my specific situation).. but anyway, I needed some extra heating in winter

It's not a matter of faith but they need some prudence here.
If you trully believe in crypto - better just buy it in exchange instead of purchasing a lot of expensive hardware and mining then at loss