I am listening to this for the first time. Actually there is no such opportunity available with Yahoo! answers to earn/generate revenues through the answers/questions over there.
Yahoo answer does not pay you money 'directly'. But through Yahoo answer you can get decent targeted traffic. And that traffic could make you money. So yes it indirectly pays money.
They don't pay you. They give you points, which gives you levels. At each level, you can answer more questions.
they dont pay but you can get some qaulity traffic from yahoo answers to your sites.find some qauestion related to your niche or keywords, give a very detailed and good answer. Put your site as a source. now when someone search for your niche or keywords, that yahoo question and answer might appear on google's first page and reader will get an idea of your site. it will organic traffic for you.