Correction: There is no ad scrubbing involved. The results pages Scroogle scrapes (output=ie) have no ads to begin with. And, for whatever it's worth, they trigger less cookies from Google (only the PREF cookie is used, when I checked).
To reiterate what I said before, the difference is Scroogle allows the user query to be submitted via POST and over SSL.
The POST method effectively limits what the server can do with the data and what it can trigger automatically in the browser, without user input. Perhaps this is good for the user (more control), and bad for the marketer (less control). As such, it could be a controversial topic.
RFC 2616 Sec. 15.1.3 discussed the use of POST in the interests of privacy.
It would be nice if the output=ie option worked with Google Scholar/Patents and if Scroogle then supported Scholar searches.