At that rate, the adbot cuts about $250 from the annual operating cost. without being quite as annoying as banners and FAR less annoying than pop-ups. I'm not a fan of it either, but a lot more than just Joe's time goes into this site. Plus the joke is on the advertisers anyway. They pay Joe to show me an ad that I completely ignore.
As for politics and religion, disagreement is the nature of the topic. That's why you have to request access. No way around it until you've converted everybody to your point of view. I'm still working on that one.