A. Quite right.
All breakthroughs are major.
I have been told that the reason lies in the software that hotel chains have installed for the use of their operatives. The software automatically sets the price of a room in response to the availability of rooms and according to the predicted demand. As more people book into the hotel, the price of a room goes up. I had a similar experience recently when I paid for a return railway ticket to Crewe, in the heart of England. Alas, the days are gone when a sales manager would set prices for goods or services and customers could expect them to remain in force for a few weeks or months.