Recurring subscriptions are pretty much how all training sites work.  It's the model that we've chosen for our site and as you said, nothing stops you from canceling at any time and renewing later.  

I understand your concern, but I don't think you will find a site that makes it easier to do that than here because we don't have a sign up fee like most others do which prevent you starting and stopping easily.  We probably don't get full value from people who practice the model you are speaking about but it's a cost of doing business if we want to make it less daunting for customers to try us out (because we are confident in our product and know most people will want to stay.).

Hope that makes sense, and as Benny said you can email us anytime and we'll take care of pausing your subscription for you.

As Praetor mentions we cannot force a payment through. Only the customer can authorize auto-renew.

I should also mention that the system is detailed in the terms and conditions that you are asked to read when signing up.