I am not charged per month. Wonder why? I just get a 'you don't have credit' note on the page.
Ah! Maybe I'm still not understanding this completely, then. Perhaps after the 12 months have elapsed OR whenever you have purchased 12 games, you are NOT automatically charged anything once a month after that? But if you do buy a game credit, it costs $6.99? (assuming you have the Jumbo membership)?
I'll go back and look at the Game Club agreement. If this is the way that it works, that suits me very well.

I am sorry for the misinformation, everyone!