Earlier quoted context omitted.
And that 1 out of a 1000 person might buy a product/service worth millions which makes the marketing and acquisition costs worth it. You're looking at this through personal assumptions and ignoring all the data when this entire industry is completely data-driven and calculated in decisions.
Of course. I'm not saying that the advertisers are wasting their money. I'm saying that it seems that both the advertisers and the ads network could have made more money with a better targeting. At least in my case, they've wasted the cost of the impression and the potential gain from showing a more relevant ad in that space. And this is probably happening millions of times a day.
Also people complain about targeting and tracking and delete cookies so there's that whole situation (which really only hurts them by giving them worse ads).