netmeg - 10:11 am on Sep 3, 2012 (gmt 0)
Google's not in it NOT to make money, so it must work across the board. Perhaps it depends on the niche. I for one would be out of business if Google served ads that were 100% relevant to some of my sites. I get ads that are relevant to my *audience* not my site, and that has worked out pretty well for me (specially this year).