I has been using adwords PPC quite sometime, but with clickbank affiliate, i can't generate sales with Adwords. I had numerous of sales by using Yahoo PPC. That's less competitor or more targeted visitor in Yahoo PPC. How about you?
I have in general found that Yahoo traffic converts better. Probably the market that uses Yahoo is the factor here.
Goes like this: MSN - Converts Good - Almost No Traffic YAHOO - Converts Semi-Good - A Little More Traffic GOOGLE - Converts Okay - A Lot Of Traffic
I have not heard of MSN traffic converting well. In fact most of the threads I've seen have stated the opposite. From personal experience, When one of my sites was sandboxed, Yahoo was more or less the only SE sending in traffic. I made a few hundred a month with that site. When the site was removed from the sandbox, Google traffic came in but the proportion of new visitors to extra income was not there. In one of Yahoo's algorithm changes, that site lost a lot of SERPs resulting in almost pure Google traffic. The income actually dropped to barely $150/month then until Yahoo SERPs picked up again.
Wow... this is surprising. Always thought Google was providing lot of traffic with high conversions...