I do still write fanfic, although mostly just when the mood strikes me (also all the fanfic I write nowadays is NSFW, so I rarely post it publicly). Part of it is also because my "day job," such as it is, involves writing for Electricopolis, so if I work on fanfic I start to feel like "why am I not doing something for my main stuff instead?"

Primarily, writing is something I do because I'm good at it and I thrive off of attention from it. This isn't me trying to be self-deprecating; the same thing motivated me when I was at school. I get more juice from external motivators rather than internal ones (e.g. the feeling of a job well done); it's just the way I am. I think that's because I never feel like I've reached a point with my work where I'm satisfied with it, but who can say?