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Yahoo seems to vary on how many overture rankings they refer. So you have to actually search on yahoo for your terms to see whether they list 2, 3, or 4 overture listings.
On terms where it is not effective, such as when a few bigger corps bid on the term, they just have more money to "waste". And if your profit margin is thin... you can't play with them.
Sometimes I will outbid them for a day or two and then drop down low again
Searching on yahoo,you look for terms where not many overture listings show up, and try them.
:) Stephen