Why is tuna sushi so expensive?

Can you explain to me why tuna sushi often commands a higher price tag compared to other sushi options? Is it due to the scarcity of high-quality tuna, the labor-intensive process of preparing it, or perhaps the reputation and exclusivity associated with certain types of tuna? Additionally, do certain factors like seasonality and supply chain logistics also contribute to the price differences we see in the market? I'm eager to understand the various factors that contribute to the premium pricing of tuna sushi.