News about ad networks doing evil tracking and such comes up all the time, but I have to wonder what all that data is any good for? I don't use ad block and yet all the ads I see tend to be either be pretty unimpressive and untargeted. They might know that I am male and they might be clever enough to show video games advertisement on a video game site, but that's about it. In a lot of ways the targeting makes the ads actually worse, as they end up covering a far narrower range of products and lead to a lot of repetition. Youtube can be notoriously bad at this, showing you the same ad 20 times in a row. There are also some ads that are extremely personalized, but they are unimpressive in the other direction, Amazon ads for example will just show me products that I just watched on their site. So won't show me anything new, just stuff I am already familiar with.
Never seen ads that actually extrapolate my behavior and interest and end up recommending me a product that I would actually be interested in buying. I found good old untargeted advertisement on TV or magazines far more useful for that, as that showed a lot of products that I didn't even know existed.