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Yahoo sends over another 15 - 20% of my sales
and Google sends 50% of my sales each day!
So the volume may not be there for MSN and Yahoo however they are sales missed if your not there!
Just have to watch your conversion and CTR!
Good Luck!
I do not like Yahoo cause their minimum click rate is 10 cents compared to google's 1 cent.
I tried msn, but it's a bother to use, very slow in setting up ads and keywords (wonder why such a large company can't invest in servers or resources).