Why is ERC20 so expensive?

I've noticed that ERC20 tokens are quite pricey. Could you explain why that is? It seems to me that being just a standard token protocol on the Ethereum blockchain, its value shouldn't be so high. Is it because of its widespread adoption or some specific feature that drives up its price? Also, how does the ERC20 standard itself contribute to its high valuation? I'm curious to know if it's the protocol's scalability, security, or maybe its integration with various DApps and platforms that make it so sought-after. Could you elaborate on these points?