Let me start off by saying this isn't a slight against the character or her fans, and yes I'm aware she's been an Avenger for sometime. Somehow it wasn't until recently visiting the "How are u dealing with your character assassination" thread did I actually think about it, of all the characters who are X-men why would Marvel think making Rogue a mainstay Avenger was a good idea, so much so that she isn't allowed to pull double duty with the X-men even though Wolverine had for years!!!
Rogue doesn't seem to me at least, as the kind of character that would mesh well with what the Avengers "do", much of which I'm not even aware of!