I'm not so worried about bandwidth...50Mbps down/20Mbps up at work and 10Mbps down/1.5Mbps up at home.
My main argument against avatars is Brett has to pay for the increased server bandwidth each month.
Another argument against avatars is that they would detract from the primary purpose of WebmasterWorld...content.
Perhaps a private chat program could be installed in the control panel...and users could interact on a "social" level...and then see their avatars there.
This would satisfy some of those chatty folks who have desires for social networking, or whatever.
And, it would keep that junk out of the forums.