Another factor though is for tech people:

1. Either they block the ad, in which case no revenue anyway.

2. Or they don't block it and it looks like an ad ridden site at first glance, so makes some people kneejerk close it.

I use an adblocker, but even if I didn’t, I’d have a very hard time to think that someone who is actually interested in the subject would think this is an “ad ridden” site and close it. The quality of the blog posts are apparent immediately.