The usual theory with lifetime offers is that you create a specific set of service items, offer that for life without changing, the theory being that the cost of offering those items decreases over time such that the payment upfront is better than the NPV of the cost to provide it.
For this to make sense though, it means that if you bought a lifetime Enhanced account 3 years go, you'd still have an account with 150M of space, no file storage, 1 virtual domain, etc.
I think it's better for us to offer fixed time accounts, and upgrade those with additional features as they become completed and not fix the feature set at what you paid for when you signed up.
Rob
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