My impression of the show prices is that they may have more to do with the content. I really enjoyed Mystere...thought it was stunning...La Nouba was good but I walked away with the impression that it was adjusted for a family audience some the edge is Mystere was missing from La Nouba.
I think "O" is more expensive because its a water show....or maybe just because its newer and at the Bellagio.
The prices are just what the market will bear...La Nouba probably gets a lot of convention groups and then everybody else is just a walk in ("compliments of Motorola").