I think you're making this out to be something it's not. I don't see how Evidon is under any obligation to explain exactly what analyses they perform on the data or what the companies they sell it to do with it. They would be divulging their own trade secrets if they did, which is ludicrous to demand of them.

In fact, they're more forthcoming about what they collect than the vast majority of companies who sell data. They list every piece of information collected right in the FAQ, and they discuss it in depth in a blog post linked to from the FAQ.

https://purplebox.ghostery.com/post/1016023438

The reality is that Ghostrank is opt-in functionality. If you don't like it or are confused by the verbiage, then don't turn it on. If you're still paranoid, don't use Ghostery at all. But don't pretend that they're being unclear, disingenuous, or nefarious just because you had to click your mouse button twice to find the information.