Let's make an example.
I've picked a random cruise: 5 nights Bahama cruise leaving on February 7th 2016.
For a DELUXE STATEROOM W/ NAVIGATOR'S VERANDAH it's 143 points per person, 286 points for two people.
To have 286 points you would need to purchase direct, let's say at PVB: $47190
To use points for the cruise you have to pay MF: $1721
Also, having paid $47190 upfront, you are missing the opportunity to invest them and get some nice return. I'm going to use a rubbish return, 3%, something not difficult at all to achive without great risks. Your opportunity cost is: $1415
Add the $95 booking fee and you get to a total spend of: $3231.
I've just gone on the
DCL website, the same stateroom for two people would be, paying cash: $1,948.56
Using points for cruises is THAT bad.