There's two reasons that spring to mind: 1. The companies faking adviews don't directly control the ad management system, so they need to fake a page view on t

There's two reasons that spring to mind: 1. The companies faking adviews don't directly control the ad management system, so they need to fake a page view on their servers in order to get the 3rd party ad manager (e.g. Doubleclick/Adsense) to record it. 2. The most obvious way of detecting fake traffic is to see that your ad click-through numbers don't match up with the actual traffic hitting your server. So to obfuscate this, you'll have your bot click through the advert then land on the advertisers page and spider through a few links before bouncing.