I honestly don't think it would be entirely awful on the customer end of the fence to receive a small discount for potential loss of play-time. Same with any subscription service.

However... I imagine that would be extremely costly to maintain and facilitate on the other side of that fence, to the point it likely wouldn't be worth it - so it's one of the few cases, PENDING THE AMOUNT OF DOWN TIME - that I'm willing to not opt in favor of the consumer.