Not only does Yahoo charge more per click but their PPC traffic is absolute crap. Doesn't convert nearly as well as Google and they charge a hell of a lot more to be in the top few positions. I can run hundreds of clicks though Yahoo and Bing and be lucky if i can convert 2 sales in a day. I found an interesting article about it here; http://www.b2blog.com/2010/07/omg-yahoo-search-ppc-is-a-rip-off.html Can anyone here say they can make a decent living advertising on Yahoo alone? I can on Google! If i do nothing but do PPC on Google i can make a very decent living.