Sigs could help people in their struggle to distinguish certain members a bit, it gives a member a 'deeper' identity. Of course it only works if people don't all use the same picture in their signatures... I recall from the BGDungeon period we suddenly had 6 or 7 people who got the exactly same picture of Drizzt in their sig, and many people replied to a certain person while thinking it was someone else because they thought they automatically identified that person because of that signature.