I don't know why, but from what I understand heli operations in general are much less expensive in Europe. I spent some bucks last year having a hot tub craned in to a site where it couldn't be carried in. The guy from the hot tub outfit said that almost all the hot tubs in Switzerland are heli'd in, and that because they have so much volume of work it adds very little to the cost...
i can't imagine any site where a hot tub could be carried in. haha. there was of course, the infamous hot tub party on the summit of mont blanc. the article has been linked here previously.