They do. Posts by Apple staff are indicated by an Apple icon.
I can't speak for the new forums, but on the old I have never received a timely reply on issues, hardly ever some very late request for more information and never ever any explaination or other form of feedback, let alone a decent solution.
The only answers I ever find are on stacksocial, coming from others who experienced the same problems.
Maybe, hopefully that will change. I am skeptical though that some fresh bling-bling environment will change apples attitude. I would welcome a serious environment where professional developers and Apple engineers can interact and exchange useful information. It would certainly help develop better software faster....