[joelrunyon]

> Completely avoiding bias in advertisement is an exercise in futility.

That's not the point of the ad system. The point is to optimize inventory + bidding. So you can bid on all of those -sure, but if you have the capability to break down children toy ads to children + to adults - you do it and have different strategies for both (broad based appeal to kids and buy-action to parents). You can be more precise with the ads + the spend so it makes sense to do it.