They do, but Bing and Yahoo does not provide enough volume. I know of a few companies that sold $100 million worth of crap through Google adwords every month.

They do, but Bing and Yahoo does not provide enough volume. I know of a few companies that sold $100 million worth of crap through Google adwords every month. There are at least a few hundred such companies. Do the math to figure out how much Google made out of this :)