Read Only Fandoms?

[krait]

Today I've been reading a lot of fic in a number of my favourite tiny fandoms, and being bunnied for the most ridiculous things (Valdemar fic? Why do I suddenly have a bunny for Valdemar fic?!), and traipsing in and out of Yuletide archives both old and new, and I noticed a trend: These small fandoms are fandoms where I yearn for more fic, but am convinced that I absolutely cannot write it. I need it, but I just can't produce! It seems unfair from both ends -- as a reader, and as a writer. Alas.

Does anyone else have this problem? I propose we call these Read Only Fandoms. :D What are yours? (All mine seem to be both small and book-based; anyone have a large or media-based ROF?)