You know, I think I agree.

In another life, I had an avatar, and I think it evoked some terribly negative feelings in some, but shoot, after x number of posts, there wasn't much I could do to shake the image. Likewise, I've seen some horribly deceptive avatars in the opposite direction - people who picked wannabe hot looking mugs who were anything but (based some real life encounters), but that little visual eye candy seemed to really color the nature of discourse for them. In short, they can be a real tool of manipulation. (And I HATE manipulation).
I've always thought how pure and beauitful the love of blind people must be - truly based on the spirit and deeper senses rather than the instant gratification of an appealing visual (sort of like white sugar?). So, yes, I think avatars would spoil the good atmosphere here.