NFTs are basically one of a kind and they differ based on rarity and exclusivity. So to put it into perspective, when you have something that is one of a kind and rare, that is somehow connected to a favorite character or a celebrity that they adore or look up to, it makes it more personal. While signed posters and memorabilia are all really good mediums too, they can be faked and copied but in the case of NFTs that is close to impossible so it makes them even more valuable than other collectibles.
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