$5/day Pinterest ads → a single printable-art PDF on Gumroad — $300+ per day from one PDF (dashboard refreshed on camera, 6 August 2025) · minimum 9 sales/day · $5/day ad spend · day 1: 0 sales, day 2: 1, day 3: 3, day 5: $300/day · broad ad set killed after 7 sales in a week; targeted set kept the full budget · ProvenStartups