I am on a couple of other cruise chat lists, and the CVC has been a topic of discussion on one of them.
From what everyone on that chat says, I would really check into this club before you sign up for it. I would say that almost to a person, they have had problems. They say that when they sign up, they're told the points are worth a certain amount, but when they try to redeem them, the value has gone down. In addition, to a person, they have not been able to get their free companion airfare, and most have not been able to book the "free" resort vacation because the dates are al=COOLways sold out through their expiration dates. One other thing I learned is that the CVC people are not Carnival employees, although they wear the Carnival uniforms on the ship.
I'd research it before I signed anything.
Chris =COOL