Cleared what up for me? You proved my point and don't even know it.
Do you think they would increase their prices that much if they didn't continue to fill their rooms more profitably? What if they raised the prices to $1,000 a night? I'll tell you since you clearly don't get it. They wouldn't have many, if any, rooms sold at $1,000. The price point would exceed demand too much. The increased profit from the potential of $1,000 rooms would not exceed the profit potential of selling all the rooms at $107. The demand is high enough for them to double prices and still be more profitable even if all rooms are not filled. Otherwise they wouldn't do it for long.
On top of that, the demand for a Holiday Inn and a Hilton Garden may be different depending on the typical clientelle, the location, the ammenities, etc. By having more flexibility with seasonality and special events, they are signalling that they are working under different assumptions for profits. Holiday Inn is using less margin with potential for more volume and Hilton Garden is using more margin with potential for less volume.
This is not rocket surgery.