I would agree with Alan here. I suppose if you had a dedicated listening room that was never used for anything else, then it might be worth exploring some treatment. But for most of us, our systems are in our living rooms. Usually, just playing around with where the rest of the furniture is located, and making sure there are no blank walls, etc. will do the trick, and adding room treatments to an already crowded room almost always deaden the room too much. I will also add that in many cases, people who have resorted to room treatments in a living room could have solved the problem with trying a different set of speakers.
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.