If they did that, people would click on ads they didn't care about, and advertisers would be annoyed.
Sorry I had to yell.
But the way they detect that is if a sites suddenly sees a lot of bad conversions.
Looking around at tech blogs and social media it's easy to spot dozens of pieces a day that might as well be ads for firms like google, microsoft, samsung, amazon, apple etc. In many ways these are far better than display ads because of the engagement of reading and sometimes commenting on a piece. The measurable difference between some of these brand's #1 fans and paid promoters seems quite small. How sure are we that some of them aren't just ads already?
You'll never be kicked out, at worse you'll be offered to upgrade to a paid account. Also, how much value is there in the people unaffected by ads commenting, submitting articles, linking to the site, etc.
The other annoyance about advertising is the interruption, which I'm not sure will go away.
And while I will (and did) concede that I am not magically unaffected, as I am human, I will point out that my actual economic decisions tend to come from non-advertising sources. When I have actual money to spend I look for reviews and the experiences of others. "But reviews are just ads too!" Not all of them, and I have gotten pretty good at finding the ones that aren't. I'm even pretty decent at reading through the reviews that are mostly ads. It's not that I'm unaffected, it's that I take paths they don't want me to take and I don't plan on stopping.
Then the ads got good enough that they started to advertise something that I might actually want.
The same thing will happen to you at some point - either it will be groceries that you can get cheaper at some other store or some product there really isn't a replacement for (say the Roomba, which as far as I recall is the only autonomous vacuum cleaner) which will save you a lot of time and/or effort.
Advertising will stop getting better once the only ads you ever see are for things you need right at the moment, in the exact place you need them.
my actual economic decisions tend to come from non-advertising sources. When I have actual money to spend I look for reviews and the experiences of others. "But reviews are just ads too!" Not all of them, and I have gotten pretty good at finding the ones that aren't. I'm even pretty decent at reading through the reviews that are mostly ads.
The perfect advertising system will be something you trust enough to substitute for reading reviews. You might think it's unlikely, but there are numerous precedents for it (eg, financial advisers advising you on things they are paid to sell).
It's true that there is an inherent conflict of interest between an advertising system and giving accurate advice. However, in the type of system envision the future value of your transactions though the system will be enough to provide a counter-weight to outright bad advice.
sites like stackoverflow are possible because hosting costs are cheaper than advertising. even as ad profit per user decreases, hosting costs per user decrease as well.
similarly, i wouldn't underestimate the value (to the advertisers) of impression advertising--the masses of people who watch TV and click facebook all day define pop culture by these impressions.
The only ads that really make sense, I think, are the branding/image/guiding type ads, not the performance-based CTR ads that have taken over the tubes.
Toyota did a whole damage control series during the purported uncontrolled acceleration debacle, and I noticed them and it influences your opinion. As do ads that build an image or general awareness: If I know about a brand of SSDs, maybe I'll search for that brand the next time I'm looking.
Ads that succeed or fail based upon a click have always been dumb. Remarkable that Google built a whole empire on it.
Other ad links? Like you, pretty much never.
Anecdote time..
Podcasts are still attracting plenty of advertisers, even with non-trackable generic ads, leading me to believe some advertisers don't care for tracking.
Check out Dan Benjamin's 5by5 family of podcasts - they're pretty much funded by advertising and most of it is poorly trackable. I don't know what he charges but from other similar podcasts I do know the figures for I have reason to believe it's higher than $50 per 1000 listeners per show - this is astronomical compared to trackable forms of advertising online.
Take television, for example:
"during the 2007-08 season, Grey's Anatomy was able to charge $419,000 per advertisement"
Independently, I found the viewing figures were 17-18 million per episode for that season. So about $24.65 "CPM". And that was one of the best mainstream, regular ad returns on TV (CSI had a higher audience and far lower charges per ad). That's half of what I know even minor podcasts are making..
On the flip side, a TV show tends to have many ads packed in whereas a podcasts runs with a few at most but in terms of CPM, they seem to trump most TV.
My point was more that TV/etc is a fundamentally less trackable audience. (agreeing with your point that some advertisers don't require tackable ads).