I wasn't disagreeing with the cost based on the number of nights, as that's a fact. I was disagreeing with the analysis that it makes a huge difference in cost - which was implying you'd be using a table service on your final day - however, you've already checked out prior to needing a table service/dinner on the final day. For most people, they are already on the road, in transit, or home already for dinner.
While the PP had it a bit backwards, I believe arrival and departure CAN make a big difference in the usefulness of credits. If you arrive late and leave early, you have less time to use credits on both ends of the trip. This can make it easier to balance out using a signature TS meal, but can also lead to unused credits.