I think it would be awesome if subbly can use LTV and number of orders to put a highlighted message inside the account page. This message could read something like "2 more orders until you get your 20% off" or "2 more orders until you get a free month!" ... Then subbly can automatically apply a coupon to the account based on that information.
This would help to reduce churn so as to keep people interested. In the end of the day, it is essentially a slight move towards having a more integrated rewards program.