Why is it expensive to fly to Bora Bora?

Could you elaborate on the factors that contribute to the high cost of flying to Bora Bora? Are there specific challenges in reaching the island that drive up the price of airfare? Do airlines face unique operational costs when flying to this destination? Is there a limited number of flights or airlines servicing Bora Bora, resulting in higher ticket prices? Understanding these aspects may help explain why flying to Bora Bora is often considered expensive.