Several people have posted substantially similar questions recently (about different domains), convinced that Ghostery mustn't be working correctly, because it isn't finding trackers on every page they visit. The reality is that there are plenty of sites that don't track, or only track in very limited circumstances. Some of the biggest names in the business are quite responsible and care about your privacy. (The ones you really need to worry about are often the little guys you never heard of).
Ghostery does scan the page. The page simply does not use any trackers.