Worth is subjective in a free market.
Sure, things are priced, but they are priced by individuals making value judgements and prices can change based on changes in value judgements. There is no objective price for anything. It’s just what someone is willing to sell something for and what someone is willing to pay. Only under communism do people try to enforce objective pricing, and it always leads to disaster.
My thumbs may be the most valuable tool I have to communicate digitally with you, but I don’t need to use them unless I value this communication.
There is no objective “use” for anything, and no objective “price” for anything. Both of those emerge because of how we individually choose to value things.
I highly recommend the book by nostr:npub1gdu7w6l6w65qhrdeaf6eyywepwe7v7ezqtugsrxy7hl7ypjsvxksd76nak “Principles of Economics” for a better breakdown of these ideas.