Once again in their defense it is possible they ask how many persons so they know how many towels and bottles of water to bring.
Now - if you tell me the PRICE GOES UP PER PERSON that is a completely different story. That is ridiculous mistake and they need to rectify that.
Funny RCCL is usally pretty on top of their web site, but not in this case. I guess.
I am the editor, but I also speculate, ask questions and play devil's advocate. I reserve the right to change my mind.