Ironically perhaps is the rather odd factoid that high end systems at the shows such as CES rarely used room treatments. Of course there are a lot of reasons why the exhibitors wouldn’t use room treatments such as they don’t wish to detract from the main event - the speakers and the amps, for example. Or they don’t wish to get all wrapped around the axle playing around with proper placement of room treatements. Or they can’t find a room treatment manufacturer who’s willing to pony up some of the cost for the room, especially if it's a big one, ain’t cheap. Even the small rooms ain't cheap. Of course the other possibility is the exhibitors don’t actually think room treatments are going to make much difference.
In a lot of these threads people say without the room being treated
It's a waste of money to upgrade you're system. The problem is I don't think most people know how to treat their rooms. I really think it takes a professional to know how to treat a room. Sure you can play around with it if you like but it could also be a big waste of time and money. And I know hiring a person to acoustically treat a room can't be cheap. I wonder why more people don't discuss this subject and make recommendations on who does this kind of work. When I look at the big picture this makes the most sense.