Free: Contests & Raffles.
I think a lot of the reason is just that you don’t see them in stores anywhere.
I went on a high end spotter search 2 years ago. Trying to find a good kowa to look through, next to a swaro, was difficult. Trying to find the model of kowa I wanted was also difficult. It was cheaper than the swaro but not significantly cheaper, so I went with the swaro knowing their marketing keeps the resale value high. Very happy with the purchase but also know I'd be happy with a kowa. I've got a nikon ed50 which is quite impressive for the cost so I know marketing definitely increases their perceived value.