[j45]

Lifetime annual discount might be more palatable depending on your cost of delivery.

Grandfathering can also be rewarded with a higher referral fee (as long as referrals are active, they can discount permanently).

It takes some planning up front with account, feature and billing management but can be worthwhile in general for flexibility.

While fewer than expected people might activate and use a lifetime deal, the ones that do can be a fun bunch support wise.