Pinterest users browse for inspiration first, so expensive niche items often get saves and clicks but fewer real purchases. Audience pools stay small, which pushes CPMs higher as campaigns scale. Creative fatigue also hits quickly because the same narrow audience keeps seeing similar pins. Tracking becomes messy too since Pinterest conversions usually happen later, not immediately after the click. Winning brands usually survive by leaning into storytelling, seasonal trends, and highly visual content instead of aggressive direct-response tactics. They also refresh creatives constantly and focus on long-term attribution windows.