My experience with the Ocean Players Club has been that on some ships you might get a small perk (last time it was a free beer on the Destiny) and many times nothing. One Thousand points on your card earns you $10. Unless you are playing huge amounts of money don't expect much from the Ocean Players Club.
7 Norwegian: Sky, Jewel, Dawn, Epic, Pearl, Breakaway, Getaway
9 Windjammer: S/V Legacy X3, S/V Polynesia, S/V Caledonia, S/V Diamant, S/V Sagitta X2 S/V Mandalay