Ric's currently on holiday for a few days, so I'll try to give you what I remember about his views as it's something I've spoken to him about in the past. He'll correct me if I've misread him. :)
Avatars and smilies tend to clutter up the board, and smilies in particular, get massively overused by some people. The simple :( :) ;) should be enough for people to deduce the meaning of a post along with the content.
Smilies also make posters a bit lazy, as it's far easier to post :rolleyes: than to actually discuss the point.
Above all of this, smilies also look a bit naff.