They're powerful and supposedly evil. What more do most anime/manga fans need? A lot of people like the bad guys as long as they're cool. Itachi has a lot of fangirls, so does Deidara, and probably Sasori does, too. Hidan might have a few, but I don't know. My friend is more or less a Sasori fangirl ^_^ I prefer Suna over Akatsuki, but people like Akatsuki because it's powerful and evil.