This is something quite a few people seem to be starting to do. Basically the idea behind this is whenever someone is using an ad-blocker, they'll be blocked from viewing your website by a software. I've personally never been a fan of doing this, and I think it's counterproductive. I use ad-blocker on certain sites, and I'd personally stop visiting most of them if they blocked ad-blockers. Have you done this? How did it go over?