Our website has done for a long time, is about Chinese wicker baskets B2B websites, now keywords ranking and websites are not bad, recently in yahoo presented a link, the hope can bring some effect, I spent so much dollars!
why not every back links and linking posting are working as i know so dont wary you are spending you money in wrong way just easy
well there are still some webmasters out there that still consider yahoo listings as they said it helps...
ust do it continue as i know every back link or link that submitted on a site or doing social bookmarking it important so just continue