Just some observations. “An sich” this site may not bring harm, but the adblock tester is a rather aggressive and unfriendly way of approaching unaware visitors of the site.
I would not like to come to such a site with a stealth adblock tester, just a question of principle.
Normally I do not block main site ads and even allow script to run when I have found a site to be benign and secure enough to visit.
Also for reasons of security I block all third party ads & scripts. We had a lot of issues with Dutch sites spreading malcode through infested banner ads. Blocking these is a way to keep malvertisers at bay. I can understand a main site wants to spread ads, they need a base and income to uphold the site, but I am not going to enable click fraud, SEO spam etc. to support cybercrime and co earning from my clicks. Not saying that this site is anyway into these practices, no way, but that adblock tester got on my nerves somehow. Be open and frank about what you like to do, but do not adblock test stealthily behind my back.

polonus