I wonder how accurate that report is. Check this out.
Across all of my sites and servers, I'd noticed my VigLink totals were running lower than normal. Turns out the ad blocker list (EasyList, I think?) and one of the others they maintain were blocking VigLink code. If you are not aware, VigLink serves no ads whatsoever--they monetize links, and you can also enable link insertion. Maybe in some remote way someone considers that an ad, but I don't. Yet some overzealous individuals got their way and it was added to the lists.
I'm not a charity, and without income, I start closing sites down. I've already closed half a dozen in the past few years due to lack of income from them--all of my sites need to earn their keep. Ad blockers do nothing but hurt smaller publishers like me. Since banner ads and interstitials are so distracting, I chose to use link monetization. It pays the bills without adding "junk" to my sites.
Anyway, I found a way to change my VigLink code (it's proprietary--I can't give it out) so that it circumvents the ad blockers. And guess what? My VigLink revenues jump up anywhere from 25-35%, back up to where they should be. That tells me that more than a few members, certainly more than 6%, use ad blockers. It does depend on the type of site you operate, though. A general interest site, yeah, it may have 6% of users running ad blockers. But on a site that attracts tech savvy users, I would bet it's much, much higher.
Having said all that, I use an ad blocker myself. Many of the big media sites (*ahem* c|net *ahem*) have made their sites so drenched in ads that they are like trying to pay attention to one clown in a three-ring circus--there are way too many distractions. The ad blocker makes sites like that tolerable.