Just sharing some info here... i get about 110k visits per month from google about 1.5k from yahoo per month so yahoo sends me about 1.5% of the traffic yet it = to almost 10% of my adsense income, eCPM for yahoo traffic on my adsense = $31.16, for googles traffic = $5.64 if i could only get more yahoo traffic Maybe the reason is the ads are from google and they probably seen the same ads when they did there search on google before they clicked to my site?
Maybe it is true. I get more click from yahoo anwser traffic but not yahoo search, the CTR is higher than google search
i would say it would totally depend on your niche. some niche might convert well with one search engine traffic than other