This smells the subtle management trick. As far as I can see you create a peer pressure. These people shouldn't come into play in the salary discussion, the salary discussion should be solely based on : what do I deserve to earn based on what I will bring to the company. Putting these people in the room - even if they don't speak - is a very sophisticated mecanism subtly repositioning the whole thing.
I would personally smell it and would filter myself out as I dislike companies using subtle management tactics very much. And I think many other people would.
Just by seeing this, I can also derive that this company is full of politics and change happens slowly there.