Hobby... but I would love to sell a few pictures so I can write this camera off on my taxes!!
I like this poll and hope this thread stays near the top until every Nikonian D2X owner answers (just because I am also curious). But I think in the end, your numbers will be slanted towards 'hobby'. Not because there are more D2X 'hobbyists', but because more Nikonians are 'hobbyists'. I get a sense that even the majority of 'professional' Nikonians have a genuine passion for photography, thus making it a hobby as well as a source of income.
IMHO, regular forum members of any topic (computers, gaming systems, cameras, etc.) are in general 'hobbyists'.