[bluGill]

Clicks are not the only use of ads, and not always the point. They are easy to measure and so everybody tracks them, but it isn't the point. The point is to get people to buy.

Now it is understood that when I click on an ad for a widget and buy the widget it is easy to tell. However if I see an ad for a widget, and next week buy that widget the ad probably worked even though it is muck harder find a cause/effect relationship.

Thus we need to keep reminding people that clicks are rarely the point of ads. The point is the sale. Radio, TV, newspapers, magazines, park benches, bill boards (and many more) all have advertisements. The people who place those ads believe they drive sales long term - and they have statistical data to back that up. All of that data came without a single click.