The problem with Google Ads is twofold.
The first is that Google is a whore. Anyone can advertise through their banner ad program, with the possible exception of porn sites or ads with nudity. I'm not really sure about those.
Second, they appear to operate by searching out keywords on the page and matching ads to those keywords. In theory, this is targeting the ads to the demographic reading the page (Thus, WoW and DDO comments will generate Gold Farmer ads).
In theory if there was a thread with "BRAS!" and "PANTIES" in it several times, you might end up with, say, a Victoria's secret ad.
<shrug> Like i said, I'm not 100% sure how these things work. All I know is, they're fairly unobtrusive and they generate a little revenue to defray the costs of this site. I'm willing to click on the ads occasionally, just to help out
Bull