Because they keep serving up ads like this:
Seriously Google™ Adsense™?
You looked at my blog, and you saw my regular use of the term, “Ammosexual,” to describe gun fondlers, and you thought that my reader(s) would be a good place for a f%$#ing ad from the f%$#ing US Concealed Carry Association?
What the f%$# were you thinking?
My standard disclaimer on any post about the aforementioned service applies:
Also, please note, this should be in no way construed as an inducement or a request for my reader(s) to click on any ad that they would not otherwise be inclined to investigate further. This would be a violation of the terms of service for Google™ Adsense™.