I am getting only 5-7% traffic from yahoo and around 55% from google for my entertainment blog. I never think to target yahoo and don't know i am ranked there or no.. so may be that is the reason for low traffic..
uhm, as for me now, yahoo index my site faster because my site is new and i get usually 20-30 hits from Yahoo each day, and Google only around 15 hits. So for now Yahoo gives me more visitor and more important keyword