A heartfelt plea

Funny you mention effort when it would have taken less effort on your part to just say "Google" (or more accurately, Doubleclick, as when you hinted at "Google" at first, I thought it was simply AdSense). ;D

I believe in forcing people to help themselves rather than rely on me. Better for everyone.

Anyone using AdSense, which is ostensibly what we use at this moment, is also using any 3rd party advertising network that Google rents out AdSense space to. I couldn't give you a list of every possible ad network they can or will throw up if I tried, there's over 600 at the moment. I'm not going to declare, guarantee, or even hint at a specific provider in the plea itself because it can change on a moment's notice.

I will also point out your question was already answered in post #1 before you asked, in the Exceptions spoiler.

As for risks; It's the internet. Your browser is a risk. Just being online is a risk. Every site you visit is a risk. Every person you talk to is a risk. Every software you use is a risk. They're all equally possible vectors and minorly probable and the bald face fact is that even if you do everything right you're still going to be a victim at some point thanks to holes in your security beyond your control, ala SASSER, so it's more practical to have mitigation in place than to try to stop every possible avenue of entry, which are unfortunately "everything".