Retention marketing is definitely more cost-effective than constantly acquiring new customers. The challenge is tracking which marketing efforts actually keep customers coming back versus just bringing them in once. Email campaigns and loyalty programs help but you need to measure their real impact on lifetime value. I use software to track ads to monitor both acquisition and retention campaigns to see which touchpoints actually influence repeat purchases. It helps identify which marketing channels build lasting customer relationships instead of just one-time sales. Much easier to optimize retention strategies when you have clear data on what works