Yes I agree, when I heard the rumours of the same deal offered I found it hard to believe. BFS wants to make a profit and doesn't settle for anything that doesn't make good business sense.. hence why they have yet to agree to FR coming in.. as they wanted subsidised (will that change?). I dont think BHD went as low as zero fee's, I believe, well from what I have heard they went for £1 per passenger in landing fee's, again this could be nonsense.
Not sure how it is set up there but I would have thought the landing/housing fees were Zero (or near enough as makes little difference) and maybe some charges for Terminal departing passengers, although £1 would be low (although it had to be a good deal to move there for sure so that might be right)
Of course that is not to mention the like of office space/crew room/engineering housing rentals which might also come into the equation if they are part of the deal.