So I am booked for a 21 day Caribbean cruise, which is a combination of a 9-day and a 12-day cruise. Thermal Suite pass is sold only as 9 and 12 days. But the pricing makes no sense to me. $176 ($19.55/day) for 9 but $299 ($24.91/day) for 12 days. Anyone have experience how they sell this on board (usually more expensive than buying before cruise?)