The deletion of account would be for free accounts ONLY. Paid accounts can be dormant, as long as you're paying.
Here's the bit that bugs me: you can earn 30% of all paid accounts you refer, which is great... but they won't pay out until you've accumulated $100 in credit. That's a lot of referrals or repeat payments on $9.95 accounts. You would think that they could PayPal it at $25 or something.
Ah well, for $10/mo for 1 TB of cloud storage, that's a great deal... IF the company remains viable. Problem is, according to the terms, they could shut down without notice and suddenly you can't get to your stuff. That would not be good. Is Shared a viable company?