Tru, if pursuing writing as a career would turn it from joy into cat piss or worse, don't do it. BUT, I do believe that you could be successful at it, and agree with your other friends that if you'd like to try, we'd support you.
Here's another idea to go along with it - a professional genealogist. I can see that one. Plus as part of the package, you could be the one who helps them get their DNA thing. You could put together a package of all your interests and offer to help others, and be compensated for it.
I know someone who knows about rocks and loves climbing around in the Cascade Mountains out here. He leads groups of all kinds on hikes and shows em and talks about rocks. And when my homeschool group tried to put a tour together with him, they discovered he is booked for that particular category of hike they wanted until Spring 2009! He loves hiking and rocks and gets to share it with people, and get paid for it.
I believe in you, Truman. Lotta people do.