Sociologists say this boils down to cultural differences.You may see avatars or photographs in western forums but lesser in asian forums because asian cultures are group orientated and conformist so individuality is frowned upon and the tendency of not attracting attention to oneself regardless of whether one is goodlooking or not.Although the younger generation is much influenced by western thought and consumer behaviour still they are very much conformist and conservative in outlook as one does not want to be a square peg in a round hole.We all want to be accepted and feel normal.The fact that you have a photo means you are less inhibited, have a good self image and confidence.How about members who have photos but not of themselves,what does that mean?