This is very specific... does anyone have any experience with the Royal Caribbean onboard credits and using them at the casino? The T&C of the Amex program says that casino charges are excluded, but the Royal Caribbean site says that you can use OBC at the casino. There are some reports on CruiseCritic from a few years ago that you can use OBC at the casino with a 5% charge. So I'm trying to see if anyone has actually tried this.