As Google reached the limits of returns in direct marketing they started pushing the value of branding (because, hey, if you can chalk it up to latent branding value there is no cap on your max bid). Surprisingly, they even got many big brands to buy their own brands AND buy sitelinks on the AdWords ads. Some went so far as providing case studies for how much of their own brand traffic they were now willing to pay for, which they previously got free.