Well, this one makes some sence to me:
http://www.gamespot.com/all/news/news_6084856.html
I agree with the hight restriction and the seperate area but the punishment seems a bit strict. All the height restriction and the other area is take responsiblity away from the store, since they can now claim that they did everything resonable, and leave it in the hands of where it SHOULD be -- the parents.