You can't "copyright" something, it is automatically the copyright of the photographer, by law. (c) statements are simply somebody clarifying that fact.
It is then the "right" of the copyright holder to decide who may "copy" the image. They can (and often do in aviation) let you do so for free, or they can charge money, or they can simply prohibit it. It is entirely their choice.
This has been the law for the best part of a century, the only significant changes being about how long copyright lasts. It applies equally to the written word.
G
This post (c) Genghis the Engineer 2011, all rights reserved. <-- this statement legally true whether I said it or not. Same for everybody else's posts.