Well they can't even get that right. After an interminable wait at "security" which is laffable, most folk who are able so to do sprint towards their gate, with their cabin lugage on trolley wheels causing serious discomfort to those who get smashed into by them.
I have always allowed plenty of time to get through this ghastly mess. I don't think I have ever seen somebody pause to buy anything. But I suppose some retarded souls must.