Again, you don't really understand how advertising works.
In fact, you've clicked on an ad today without realizing it.
Few people will admit to clicking on ads. And they will probably honestly believe that they don't click on ads. The best ads work when you don't even realize they are an advertisement. The best ads are a service that benefits you. Hacker News is a prime example: In a sense, it is a giant advertisement for YCombinator. We don't think of it as an ad, because it provides value to us as more than an ad. Here you are, in the middle of an ad.
Most people, when clicking on an ad, don't think about the fact that it's an ad. They click because the ad offered something interesting to them. It is not always even obvious what is an ad, and what is not. The lines get very blurry. For example, 'guest posts' on a blog, sponsored posts, 'paid links', etc. There are many, many various types of advertisements.
But even when ads are obviously ads, such as Google Ads, they aren't necessarily obvious when you are interacting with them. Effective advertisement is transparent. Indeed, there is a blindness to it: You don't even realize it is an ad. Again, think of Hacker News.
> No, I understand the ad business perfectly well; that is entirely different from thinking CPM ads make sense on the Internet.
So, you're saying CPM ads don't make sense, therefore we should block them as a revenue source for websites?
> Once you see which part of the website is "the content", your brain enters a mode (in the vi sense of the term) where anything other than content on the page will be filtered out at a pre-conscious level.
If this is how the world worked, then advertising simply would not be effective. For example, in a print magazine it is generally super easy to differentiate between the ads and the content. And yet, magazines such as the New Yorker continue to make money hands over fist.
On most of my websites, the ads are very easy to differentiate from the content, and yet people still click on that at alarmingly high rates. (Yes, it is alarmingly high, and I'm thankful for it every day!) "Banner blindness" is a nice theory, but the world simply doesn't work that way.
People ignore ads when the ads aren't relevant to them. For general audience websites that have a large amount of CPM advertising, such as Yahoo, this can be a problem. It is a problem they are not addressing very effectively, in my opinion. But the problem is not 'banner blindness', the problem is poorly targeted advertisements. Ad Blockers exist, in my opinion, because of the many scammy/spammy ads that seem to appear in place of well targeted/high quality advertisements. And it IS a problem.