If you want to gain perks through points in the casino, avoid Princess like the plague. There is not ONE employee of Princess that can tell you what the points are for. Unlike other lines, Princess has no schedule of tier level that show perks.
I have gotten free cruise offers, but they may as well be assigned by lot for all the explanation they give you. I have over 600 nights on Princess and have sworn off of them.
Don't believe me?...go ahead and get the run around from the pot boss to the host to the casino manager to the princess casino site when you ask what the points mean as far as comps....
Doug