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Old 03-18-2011, 04:50 AM
MsChilePepper MsChilePepper is offline
Join Date: Nov 2009
Location: Seattle area
Posts: 209
Former travel agent here.

As with hotel rooms, the cost per night or per week for the cabin is a fixed amount. With a cruise, each passenger pays an amount that includes the room rental, plus meals, plus entertainment, plus on-board amenities. The regular rates are based on the most popular arrangement, i.e. two people per room. The cruise line would lose money on the second half of the room rental if they allowed a single to just pay the regular rate. The single supplement adds the second portion of the cabin's rental to your fare.

However, some cruise lines will do something called a guaranteed share, or some other similar term. You pay the regular rate, and if another single person of the same gender also books that cruise for a guaranteed share, you get a roomie. If no other single books, then you get lucky.