Nope, don't feel the same way at all, and I don't know about why others don't use their real photos, but I've two reasons:
#1 I don't want my mug shot to be circulating all over the net without any control nor say on my part.
#2 Writing or posting anything online is for a buck here and there, and for that nobody needs to see the looks of me.
I reckon if one is here for the social aspect, then maybe a photo makes better sense. Dunno :)