Playing devil's advocate,

Its big business for the tuna dealers, though not a great example I guess you don't want tourists walking around the NYSE(which isn't open to public tours).

If you're going to build a tourist viewing booth, you'll run into, who should pay for it? The tuna auctioners? the local government, no one wants to pay for it. Unless I guess you start charging admission...

Don't beat me up on it, I was just thinking from the other side.