Your not alone Read: http:// webpronews.com/insidesearch/insidesearch/wpn-56-20050822ALookAtAdWordsConversionsVersusYahoos.html Thats why I use overture
Is a subjective article that say: "overture converts 10% and Google converts 5% by the half of the CPC price". But they don't give a solid base how the have this conclusion. I don't know why people loose their time writing articles like that.