Um, I frequent the Kosher board. At the top of its page is a banner add for "Put More Pork on Your Fork"! In the Kosher board, really?! It's a little tasteless, to say the least, maybe even offensive (to me).
Might I suggest some "Specialty Board Switches" fields in your ad database? This would check the ad against these "Specialties" (e.g. Kosher) to verify if the ad fits well with your specialty boards. If they don't fit (switch field is "Off"), then keep trying to find ads that do.