What is Prime and why is it so expensive?

Could you possibly enlighten me on the concept of Prime? I've heard it's quite pricey, but why is that so? What exactly makes it stand out from other cryptocurrencies or assets in the market? Is it because of its limited supply, or does it possess some unique features that drive up its value? Could you please elaborate on its unique selling points and why investors are willing to pay such a high price for it? I'm genuinely curious to understand the reasons behind its high valuation.