For me, at least, I tend read less fic for shows that somehow already address the things we usually write about in fic. Farscape, for example, does things on SCREEN that even the nuttiest of fic authors wouldn't do, so I've never felt much compulsion to read the fic.

On the other hand, with Harry Potter, JKR has created this marvelous universe and left most of it unexplored or open to interpretation, so it leaves me wanting and needing more.

Joss's shows have always fallen somewhere in between those extremes, so I wind up always wanting more, but usually just about the characters I love.

Oh, I don't know. My brain is all mushy right now. i need more coffee, too. And fewer student papers.