I booked a hotel for 4 nights for a total of 154,000 pts. I then decided to add another night, since it should be free. Well, it wasn't. The total for 5 nights is now 169,000 pts, obviously not being charged for a full night, but why did the total change? I also tried adding the extra night on the front end, and again the total was more points than 4 nights. How do they calculate this?