yahoo answers is a great way to make money, i have tried it. If you are looking for very targeted traffic you can get it there. but one thing you should know is that you will get banned so fast. realistically this method is not easy as it once was. right now you need good investment to really see some success. Level 2 yahoo answers accounts aint cheap.
Yahoo Answer is a great source of traffic if use well. The trick I use is to answer 4 question without any link, then the fifty one will include a link to a post relating to the question. But if I don't have a post relating to the question I simply type something this "See alternative here" then my link goes under the phrase. Hope this helps?
I think that Yahoo Answers is worth it if and only if you target very specific people. Make sure that your answers are high quality, and you should be fine. It is a little annoying to get up to level 2, but it's nice when you get there. A little trick I use is to answer only unanswered questions in which the asker seems to be desperate for an answer. They usually pick you as the best answer and go to your site.