That's why I wanted more details. It's implausible to me that so many people would choose Google over Yahoo if Google delivered worse results for more money. I'

That's why I wanted more details. It's implausible to me that so many people would choose Google over Yahoo if Google delivered worse results for more money. I'd also be confounded at Google's ability to do so while hiring so many smart people. Perhaps Google delivers more purchases per click, or more repeat customers (they are worth something, aren't they?). Perhaps Yahoo is particularly good at certain kinds of clients (that's why I asked).