Why is sushi very expensive?

I've always wondered, why is sushi so expensive? Is it because of the intricate preparation process, the high-quality ingredients used, or the skilled chefs behind each dish? I've heard that some types of fish are extremely rare and hard to come by, which could certainly drive up the price. But is that the only factor? Are there other costs associated with running a sushi restaurant that contribute to the steep price tags? I'm curious to know the real reasons behind the high cost of sushi and if there are any ways to enjoy this delicious cuisine without breaking the bank.