@gorang
Driving traffic is highly effective using Yahoo Answers. Think about how many times you've Googled something and how frequently your answer was at the # 1, 2, or 3 spot and it was Yahoo answers. Yahoo Answers has such a high authority and page rank that it'll overpower other websites that actually worked on their SEO.
You do have to do a little research of your own as well though. For low competition keywords, you'll show up on page 1 almost right away. For higher competition keywords, it'll require a bit more work, but if you know what you're doing, you'll see that it is not very difficult to finally get your page to show up.
Yahoo Answers does not provide "link juice" as the links are no-follows. But at the end of the day, do you really care? As long as you're getting DIRECT traffic into your site and your end goal is achieved (ie: sale, opt-in, forum signup, etc), that's all that matters no?
Swipe allows you to shortcut all of the manual processes that ppl hated about marketing through Yahoo Answers!
Let me know if you have any more questions and I would love to help
