The vendor is somebody, the same as anybody else (albeit some are dishonest), and they have found or bought or made these coins and so are trying to sale them for making money. Specifics for tellers about specific denominations The U.S. government redesigns currency to reinforce the security of banknotes, https://ammonc455kif3.worldblogged.com/39341114/the-smart-trick-of-what-us-currency-is-the-most-copyright-that-no-one-is-discussing