The majority of the world doesn't block Ads.

Adsense is doing just fine with earnings.

Adsense can definitely be a major part of your site's income. Can't hurt right? Rule of thumb is the bigger the ad space the better it'll do, and you'll always want to make sure to place three per page and all above the fold.

I'd say certain niches block ads - people that are heavy into technology, web browser technology and perhaps the savvy gamers. Outside of that I think it's pretty rare.

Of course AdSense is still profitable. Take a step back and look at it from Google's perspective rather than that of a website owner.

Google AdWords is Google's main advertising product and main source of revenue.
Google's total advertising revenues were USD$42.5 billion in 2012.[2]

They are doing just fine.

Sounds like the IT guy is smart enough to install adblock for all of the employees preemptively.

As far as earnings concerns, there isn't much to worry about. Only a small percentage of internet users actually know how to use adblock to begin with.

And the actual creators of the major browsers will never try to promote adblock into the mainstream, because it would go against their own company earnings to do so (Microsoft makes IE whilst earning from ads on Bing network, Google makes Chrome whilst earning from Adsense).

cool, good to hear guys. thanks