I had initially booked a BTB on Odyssey of the Seas for this November, 2020 (which was cancelled) and now I have a BTB booked for November / December 2021. The cruises are 6 and 8 nights each. I usually do the prepaid gratuities when I book online or with an agent (all of these booking were done online myself). Given that RCL charges $14.50 USD per person, per day, the grats should be $174 USD for the 6 night sailings and $232 USD for the 8 night sailings.
The reason I ask is that when I added the prepaid gratuities for all four cruises, I was charged $520.16 CDN (which is approximately $397 USD) per cruise. It was the exact same amount for all 4 cruises, no matter the length of the sailing. This works out to approximately $33 USD per person, per night on the 6 night sailings, and $24.80 USD per person, per night on the 8 night sailings. We're traveling with another couple on one of the sailings, and they had the exact same issue. When I phoned, RCL wasn't able to handle the math (or my explanation), so I just had them remove the prepaid gratuities entirely.
Anyone else have any issues with prepaid gratuities on Odyssey of the Seas bookings? You might want to check...