Quote Originally Posted by Taliph View Post
Where on the original packaging or in the advertising of either the game or the game system itself did it say that "additional charges may apply"

Subscription costs were mentioned, such disclaimer is nearly required by law.
Additional charges may apply only if you make a deliberate decision to purchase things. You aren't going to be hit with sudden unexpected charges. You don't have to pay a cent beyond the subscription cost if you don't want to.