Doesn't that assume that the targeting information gets used appropriately? My understanding is that advertisers bid on placement and the largest big gets the prize, regardless of whether or not they are using it "correctly". So it wouldn't matter if BMW wants to target people with new job promotions if, e.g., Rolex is outbidding them for "luxury".

The vast majority of ads I see are of no relevance to me. It makes me assume that the companies that would have relevant products just aren't spending as much as broader interest stuff, bringing us right back to square one.