I for one would like to be able to change my Avatar as I am finding it distressing to frequently being referred to as "her, she or other female names" when I am a male and have informed my fellow members but my avatar is the problem which shows a female.
Everyone has their own reasons for a chance to change the avatar. Saying all this I was not given a choice of which avatar I would like when I joined the game over 3 years ago as I have read by some other members.
We should only be able to change between the present avatars available which could be done within there script but that's just my opinion