Who would pay $7000+ for a rifle? Depends. If I were planning a trip to Africa for dangerous game it would have to be a consideration. For most of the continental US, not so much. In a lot of our hunting we are used to longer shots in which a scoped rifle is the better choice and far easier to shoot accurately. A scope on a double just doesn't look right.
In North Dakota, who needs a .375? With need being the operative word I would say No One. Then again how many of us buy only the stuff we need? Not me for sure.
Is $7000 expensive for a gun? For most of us I'm sure it is. Then again there are a whole bunch of people and I'm sure members on this site who fish out of a $50,000+ boat. And they"re not towing it with cheap trucks. Expensive is always in the eye of the beholder and what you can get away with without your wife discovering the full price.