There is a specific booking problem this house solves. A group of fourteen or fifteen usually gets pushed into a seven-bedroom estate at estate pricing, because most five-bedroom houses stop at ten. This one sleeps fifteen across five flexible rooms, which is unusual and is the reason to look at it.
The second reason is the dock. Kayaks come with the house, so paddling is a decision you make at breakfast rather than a booking you make in advance, and a chartered boat can collect the group from the property instead of a marina. Inside, a separate media room gives fifteen people somewhere to be that is not the main living space — which at that headcount stops being a nicety.