Nope. I only write for a fandom if I’m really into whatever it is, and for me the last sort of bastion of “zomg I love this so much” is to create for it. I’ll have gone through all the previous levels of:
– browsing reviews
– looking at promo pictures
– finding the fansites
– watching fan videos on youtube
– reading fanfic
– reading metas
and all the other phases that I’ve forgotten but then it gets to writing reviews, writing headcanons and making stuff.
I’ll never say never though. For instance if I ever did a fic challenge, like “post all the shows/movies that I love and you pop one in my askbox, I’ll write a short fic” – that sounds like fun now I’ve thought of it, but in that case then yeah I might wind up writing for something I haven’t read as I haven’t read for everything that I like. Although I usually wind up searching for fic eventually 🙂