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Majority of Americans now use ad blockers
(www.theregister.com)
This is a most excellent place for technology news and articles.
I know ad rates and metrics are heavily based around click through, but does it even actually matter? I mean, TV ads are big money expensive, and nobody has ever clicked on those. I guess if you're advertising a shitty mobile game or something then it matters, but does McDonalds or whatever even want you to buy a hamburger before you watch a YouTube video? That doesn't really make a lot of sense.
As you've noticed, there are different types of ads. Not all have clicks as their goal. Some are just there to make you think about their brand, for example.