How come some sites can manage aderts properly?
A few sites I use, I see ads, I click on them, I buy from them.
Why?
Because they are from companies directly applicable to that site, a forum for x has adverts from companies involved in x. And they are small banners.
eg a model railway forum has adverts from model shops, manufacturers, magazines, auction houses.
OK not the last but "ooh a nice new wagon kit I need that" gets a sale and my click through helps pay for the site.
If every site was like that ad blockers would not be needed.
Oh and I could not boycot the advertisers without getting a different hobby!