Recently a thread started at Threadwatch points out that Google Adwords Research Tools Aids the Competition.
“Jeff Staub comments on Google's disturbing use of free keyword tools in determining ads to show in Google results. Essentially, by using their associative tools to research an untapped niche, you tip off Google to fill that niche with related ads, driving up bid prices in previously profitable markets.”
It bagged a multitude of responses. One of them states, “Maybe Google just happened to roll out a new update right after he did the research. Why would Google rely on his research? What sort of quality control is that? If Google follows the keyword tool then presumably he could chose all the wrong words just to mess with Google and screw his competition.”
Another one comments, “The story he describes is lacking good and proper research. i think something is going on because i also had a similar experience. i created an ad for a made up keyword (i made sure the word was not even in google's search index) and in about a day i had other sites displaying around my ad.”
Follow the thread for the inside theory.