I love shooting stock. It is how I got started in photography. I'm a web developer full-time and I came across SXC and started using images from there. My in-laws chipped in with my parents and got me a camera for my birthday one year and I decided to try my hand at giving back.
Watching the downloads climb (even if I was giving photos away for free) was very gratifying. As stated before, it's nice to know that someone was getting some use from photos that I created.
Then I noticed people in the forum talking about how they were getting paid doing this. That was it for me! I've never looked back and now have a studio in my home just for stock.
Click here for some recent examples: I love what I do. I don't know if it will ever be my primary source of income, because I love my day job as well. However, as long as I'm able, I'll photograph stock!