I used to change it a few times a while back, but nowadays I don't, and I find it mildly irritating when someone else does. I recognize a lot of people based on their avatars, and sometimes even only remember the username through a means of association with the avatar.
But hey, your funeral. You don't want to fame-whore? BE MY GUEST.
But hey, your funeral. You don't want to fame-whore? BE MY GUEST.