* of special interest - the advertiser and the vehicle are divisions of the same company - and they're looking for advertisers for themselves at Google's own advertisers' login page.

Google's website is their front door, their billboard, their marketing tool, their catalog.
It's their virtual office where they provide their products and services.
It's their brand, their face, their property.

Google should consider (and view through their own testing) the possibilities of who else may buy ad space that triggers off of their domain name and their site's content.

Further resources.