For me, I treat this as a hobby and I truely want to help others. I have been living outside of HK for quite a few years and I would like to help and answer other's question with what I know. And I find it's a very good exercise for me to do some translation because I don't have a lot of chance here to interact with Chinese and doing translations will improve my thinking.
I know that the scores meant nothing but I think some people think the more score one gets or the the higher rank (like doctorate, masters, etc) means that more people recognize their contribution to yahoo knowledge.
This may not make any sense to you at all, but if people are happy with what they are offering and others get their questions answered, I think it's a good interacting platform
圖片參考:
http://hk.yimg.com/i/icon/16/1.gif