I don't actually write fic for consumption, because I haven't got anything like the discipline required, but yeah, I think the urge to fic is built in.

*nods*
Now the question is just, is it a universal thing, an urge that everybody has? My theory is that some people just don't have this urge... but I need more data to back that up. I need to talk to people from the "Fanfic is stoopid and you're wasting your life, kid!" camp.