But then I read something like "Hugh Grant Explains It All For You" by ljs (one, two, still in progress) and I say "Oh, okay, I get it now. A good writer can make me believe anything. I am putty. Please to be giving me more of the Giles and the Anya."
Though sometimes I suspect that the attraction of Anya is that she's more of a blank slate than some of the characters are. Set the vengeance tediousness aside, and you have a great deal of latitude for building a more interesting rounded human being. And thus fanfic!Anya can be vastly more tolerable to me than canon!Anya.