Websites need ads (or subs) to survive. The default setting you operate on should not be to starve them, and you should not need them to tell you that before you act. If you were not blocking by default, and only blocked when a site was particularly invasive, your position would be far more defensible.

If showing flashing ads wouldn't have been causing me seizures and if that it weren't the norm to show that kind of ads, what you said could work.

Also why am I paying for something without seeing what it is?

"Here's our content, maybe help us keep producing it by showing our promisedly sane ads?"

I buy a subscription or show ads to 90% of the web sites I visit more than a couple of times per month, as long as they offer them.