What is the most expensive cat breed?

Could you please elaborate on what factors contribute to determining the most expensive cat breed? Is it solely based on rarity, or do the breed's temperament, health, and other characteristics also play a role? Are there any specific breeds that consistently rank as the most costly, and if so, why do they hold such a high price tag? Lastly, are there any ethical considerations or potential drawbacks to owning an expensive cat breed that potential owners should be aware of?