You don't get Plantinum until your 10th cruise. We just took our 10th cruise and on that cruise we got our Plantinum cards and all the benefits. The benefits are so much more that what the people that pay $50 for. Look online and see all the benfits of being Platinum.
Private parties, chocolate delivered to your room, wash and fold for free, Carnival logo gift, Priority tender, rooms available when you get on board (our luggage wasn't really any faster), but still completely worth it. And when you print out your boarding pass and luggage tags for the cruise in November.... IT WILL SAY PRIORITY!!!!!!!