The was a lady on Princess that lived onboard, generally one of the smaller R class ships, Lorraine Artz (my spelling could be quite off). I was in the cabin next to hers (she was in one of the aft suites on the ship) on one cruise. Real nice person from the brief time that I interacted with her, and you could tell the crew loved her (heck, when we docked in one port with another Princess ship, a number of crew came over to greet her when she got off the ship). I think she was well over 4000 days at sea, and was the godmother for the R class Royal Princess. I'm not sure she was paying full fare though, there were some rumors about her having owned land that Princess decided they wanted for their headquarters, or something like that.