I was a H/Hr fan (I never used the "Harmonian" description because it seemed to be linked to crazies). The difference for me, however, is that I found I didn't like how HP was going and simply stopped reading it. Well, I do admit to being very irritated with JKR for the "need to reread the books" and "delusional" things, because those are still your fans, you know. But with Avatar, I didn't have any expectation for Zutara to happen, so I didn't stop enjoying the show itself, even if I am not satisfied with the ending.