I love the idea of targeting advertising. But the current implementations I hate.

The ASR voice recorder app gets this right. It lets me use the full featured version for three days, after which I need to watch a few ads to get another three days. I choose when to watch the ads, and if I'm late there is nothing worse than a small nag at the bottom of the app. I actually now start every day with the ads, while I cook breakfast, and it is a positive experience. I could also just pay for the app and be done with them.

The problem with the idealism of targeted advertising is that it assumes that there is always an ad that fits your desires. In reality, some people have very niche interests and preferences, and not every business advertises through the same channels or with the same budget. Ads will pretty much always cater to the lowest common denominator even if you account for the individual.