That it's exactly the right level of mentally engaging that I could do it forever. It's a puzzle, it's an art form, it's a skill to hone. There's always some aspect to practice and improve on. You can learn so much from others, too, and inspiration can strike even when NOT writing. IT'S FUN!!!
Bina
someone asked this on tumblr & I thought it was a great question, so I'll ask it here:
what is your FAVORITE THING about writing fanfiction?