Why is flying to Bora Bora so expensive?

I've been looking into booking a trip to Bora Bora and I've noticed that flights are significantly more expensive than to other destinations. Can you help me understand why that is? Are there specific factors that contribute to the high cost of airfare to Bora Bora, or is it simply a result of the island's popularity and limited flight options? I'm trying to budget for this trip and would appreciate any insights you can provide.