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As of December, the Casino Royale scheme requires the rewards member to pay a “discounted cruise fare” for the second person. Before December, Club Royale participants at the Prime or higher tier levels were given an annual complimentary cruise for two. This month, Royal Caribbean quietly overhauled its Club Royale rewards program.
While comps and tier benefits are generally prescribed based on your gameplay, the casino host has some autonomy to offer perks at their discretion. One cool aspect of this program is that Carnival considers status from any casino, not just the big names, so the status you've earned at smaller, local venues is worth entering. Your existing status with land-based casino and hotel programs may also qualify you for perks on your next cruise.