Zero To Sold: Gumroad Day posted on August 12, 2022 Arvid Kahl slashed the price of Zero to Sold to $5 for 24 hours as part of Gumroad Day. Within 20 minutes, he was selling three copies per minute. After three hours, he’d made 124 sales. Within 12 hours, he had sold over 400 copies. By the end of the promotion, he had sold 655 copies and earned $3418.82 . He also had an increase in blog visitors.