You cannot walk into Barnes and Noble and take a copy of Penguin Publishings'
The Complete Works of William Shakespeare off of the shelf and walk out with it without paying just because the work is in the public domain (Note: lets not get into the digital vs. physical depriving anyone of content argument for the 10000th time).
Time and money was spent organizing and publishing the book / article, so they do have a right to charge for it. If you want wholesale free access to public domain documents, then you find a place which will provide these to you for free. You don't get to ignore a companies right to charge for something just because you disagree with the premise.
