papillon78, when you purchase a template, it is not a subscription. You are purchasing one template and the documentation that goes with the template itself.
The Documentation Subscription, which mariealline refers to, is a subscription that includes CB documentation (which will enlighten almost everyone to new features they haven't found without it), plugins which non-subscribers do not have access to (as a thank you for supporting development), and access to plugins and future CB versions before the public receives them.
Hope this helps.