Google's money comes from adwords, as it stands, in my field (travel) half of Google's income is coming from affiliates, who work in there underpants from home. With huge turnovers they are happy with 30-60% nett profit on spending. Hey most of them dont pay income taxes either, so nett is nett for them.
That said, there is not much space for google to gain extra adwords income.
Indeed Google will have nice profits the comming years, but to me the 'extra' will not be there.
Moreover, in case google has to hand over there search results, investors will see that a huge chunk of the searches are Adult & Gambling related, nice way to show that google is the ultimate gateway to P!orn.
Peter