didn't the contract with yahoo expire and they(yahoo) now run there own engine.
Think how much it is for an add at the side of google/sponserd link and think how many keywords/combos of keywords there are and that is the amount of possible profit from advertising they could make.
Spammers next time you spam me consider the implications:
(1) that you will be persuaded by me(in a legitimate mannor)
(2)It is worthless to you, when i have finished