Apple managed to make the Macintosh, the iPod, the iPhone and iPad without an advertising business so yeah being maximalist and saying "This industry has nothing of value to add to our company" can result in great things.

How many billions do you think Apple spent on advertising to get to this point, what do you think? Seems like that's a tremendous amount of value for Apple, as a customer at least!

Running an ad campaign != running a advertising banner company.

Absurd to suggest these are even remotely related.