Easy: Votes are an unlimited resource because a user can vote on as many posts as they want and a person can create basically unlimited user accounts, thus the fediverse would be like a market where everyone can create money out of thin air, defeating the purpose of having a market at all.
The fediverse would be more like a market if users had to "earn" votes by posting stuff other people vote on then "spend" those votes on other people's posts. Then votes would be a limited resource that would make sense to apply market principles to.
Wrong, Bitcoins are mined at a fixed rate that decreases over time until the supply reaches 21 million, then there will be no new Bitcoins created: https://crypto.com/bitcoin/how-many-bitcoins-are-there