Google is trading above $400. In the last quarter, their revenues were above $1.5B. This means that they are selling a ton of ads.
The way Google’s advertising model works, most of these sales happen when someone clicks on an ad. It’s very much a pay-for-performance model. This means that a ton of people click on these ads.
Who are these people? I don’t think I have ever clicked on a Google ad. In my informal surveys, my friends and colleagues do not seem to click on these ads, either. I am very curious.