Maybe I'm unique in this experience, but the "actually more relevant to me" part is just never true. Most of the ads I see that are delivered via these auctions are just garbage or scams or "relevant" in a tenuous pointless way.

The only really relevant ads I've seen are from blogs that literally just sell ad space to brands and the ad is just a simple image link you can click on. Philosophy blog? Philosophy book ad. High end men's clothing blog? High end men's clothing brand ad.