Coin Tokens can only be taken off from a player's Coffers in that player's Buy Section (or when instructed by a card for example Butcher ). This cost is principally accustomed to determine how much Coin need to be fielded by Treasures and Actions to get a card through https://financefeeds.com/asymmetric-research-joins-stacks-ecosystem-as-key-security-contributor-for-sbtc/