This is a common problem when members forget there subscription is automatically renewed.
Planet Sand does not take money from any such members/accounts, it is the member who actually sets up a recurring account thru Paypal and its Paypal who debits the renewal automatically. The Planet Sand Account only receives what Paypal sends.
From the first time you elect to subscribe you are asked to choose your Payment Method, you are displayed the Group Details which includes the comment (recurring), located in the area before you Click on Subscribe.
The next screen you will see is the Order Confirmation Screen, which again displays the terms (recurring) next to [Continue] or [Cancel]
If you didnt Click on [Check or Money Order] you would have selected to pay via Paypal and Planet Sand would have transferred you over to paypal.com, as shown below confirming it is on a per year basis.
To see the next screen you would have provided Paypal with Login Information or Created an Account with them, they also display details of your order for review and and make you [Agree and Pay] to proceed explaining to you this following message.
Future payments will be made with your default payment method unless you select a preferred payment method, To make a change, go to My Money in your Profile, then update the 'My preapproved payments' section.
If you click [Subscriptions] in Planet Sand you will find status of your account in this detailed box at anytime.