It is too risky in case things go wrong and the attempt fails. If others want to do that, though, I have no problems with it. But me... I haven't posted a photo of myself on the internet in over a decade, I think and I want to keep it that way. I don't even use my regular username on this site to keep myself as private as possible. Although, if I decided to publish my autobiography, it will not be too difficult to make a connection between "millefeui" and my regular internet alias. But by then, I will be dead, so see if I care.
I also don't want to break the mental image people have of me. When you don't know how someone looks like in a forum, it is common to associate their appearance to their avatar/profile picture. That... works for me. And this sounds a bit pitiful, but I don't care.