Separate enrollment from durable retention
An initial subscription order can be driven by the discount without creating a long customer relationship. Measure how many customers reach later deliveries and how contribution develops after cancellations, skips, returns, and incentives.
Build a cohort view
- Enrollment month and initial discount level.
- Scheduled, completed, skipped, canceled, and returned orders over time.
- Net sales and variable cost for each completed delivery.
- Advertising or promotion cost used to acquire the subscriber.
- Cumulative contribution by customer cohort.
Include replenishment reliability
Subscriptions create an expected service commitment and a more visible demand pattern. Inventory shortages can cancel the benefit, while excessive safety stock can consume the margin gained from repeat orders.
Increase the incentive only with evidence
Compare cohorts or controlled periods to see whether a higher discount improves retained deliveries rather than only first-order enrollment. Set a payback limit and stop when the added discount does not create enough incremental contribution.