brneyes- I have no knowledge of the website you are discussing. But, on your question about wether or not you are looking at a good deal... I mentally track cruise prices from the sale email flyers I see from RCCL and CCL and NCL, so I can pretty much tell when I'm looking at a good deal. Same goes for airfare. I book enough flights that I know what a good price is or what a typical price is. If you are using that sight as your only basis for what fares are doing, I'm not sure you are seeing the whole picture.
Carnival Cruise Lines:
Fantasy 90, Celebration 95, Victory 05, Conquest 05, Spirit 6/06, Freedom 6/08, Holiday 7/08, Victory 6/09, Valor 9/09, Dream 6/10, Splendor 8/10,Conquest 8/11,Magic 11/11,Triumph 4/12,Spirit 7/12,Freedom 11/12, Triumph 2/13 - The fire cruise, Magic 1/14
NCL Dream October 2006, RCCL Mariner OTS June 2007, Celebrity Silhouette 2013