Good points. I'm making note of the macro comments.
The only problem with giving voters more than one choice is that the results would not easily tell much about primary usage for the D800 among individuals. When I've done private research of this kind, a form submission with a set of questions and choices is used to determine the depth of information implied in your post. I wish the forum polling setup had that capability.
The overbalance of primary usage toward landscape shooting of all kinds is somewhat surprising to me - almost twice as much as all others combined. Landscape and wildlife together are two and a half times as much as all others combined. It seems like photographers make choices with only scant attention paid to Nikon marketing efforts. Experienced amateurs and pros alike seem to know what technology is best for them.