When I purchased the game I found out that a credit card was needed to activate an account, it was said that I would not be charged for a monthly fee or anything else, first month is free and you would only need it to activate. but now I have been charged by credit card for a one month fee. so not just for activation only you do get charged, what's up with that?
Requireing a credit card to active a subscription to an MMO is standard(unless its a POS F2P).
That being said the only activity you should see on your card once you activated is a $1 authorization to check to see if the card is valid. The $1 authorization is returned to your account after a few days.