It's hard to imagine just how much the height of Everest affects the feasibility of any "normal" infrastructure as a tourist spot. The air density is exceptionally thin (so thin that even helicopters cannot climb past a certain point), and the lack of oxygen is literally killing you at a cellular level the longer you're there. I can't even fathom getting building equipment up there to set anything up, and no one could man any of the infrastructure on a long term basis.