When a question goes into voting on yahoo answers?:
It's a little pointless and egotistical to do so. The idea of this site is that we collect information from various viewpoints, and then allow others to judge the value of the content.

Voting for your own answer defeats the purpose, so certainly is unethical. It's most likely against Yahoo!'s rules too.

I can't imagine how anyone can feel they've 'won' by voting on their own answers - it seems SO childish. There are no prizes and no bragging rights here - we're all just trying to share our experience and information.