My gosh. I know there is one cabana (I think a half moon cay) that is really special and comes with a bar tender, chef and its own snorkel gear - Did you get that one? for $219 for a cabana on an island? I hope so.
If that is for the regular cabanas that sounds outlandish. You could stay in Atlantis for the same price.
I am the editor, but I also speculate, ask questions and play devil's advocate. I reserve the right to change my mind.