How much does 1 NFT cost?

I'm curious about the pricing of non-fungible tokens, or NFTs, as they've become quite popular recently. Could you possibly elaborate on the factors that determine the cost of an NFT? I've heard rumors about some selling for millions, while others are priced much lower. Is it simply based on rarity or popularity? Or does the artist's reputation, the uniqueness of the artwork, or perhaps the platform where it's being sold also play a role? I'm really fascinated by this emerging market and would love to get a better understanding of its pricing mechanisms.