I had tried Ars without ad blocking quite a while ago when it had a banner that detected ad blockers and displayed a message. I found lots of third party trackers and decided to turn ad blocking on again. Even if the UI has improved with the ads in the recent times, the UX and privacy concerns are quite bad.
I don't subscribe to Ars for a few different reasons. My visits to the site have reduced drastically in the last couple of years (just a few times a month) and it's quite expensive for me. If Ars stopped using those trackers and also dropped the subscription price even by 50%, I would consider subscribing. I don't know if buying a subscription only turns off ads while keeping the trackers on (for an overly broadly termed reason called "analytics"). That would be practically useless for a reader like me.
Frankly, I believe Ars (and other sites) could make more money than they are now by reducing the prices and letting in more people from various backgrounds and geographies (currency conversion rates and all). Being one of the better tech sites, Ars could also be a good role model if it eliminated all those third party trackers (no clue what influence its owner, Condé Naste, has over such things).