You're looking at remnant inventory. Inventory (advertiser speak for "a page view plus a slot available on that page which we could sell an ad against") are a lot like cuts of meat. Some are worth a lot of money. Some are not, and end up getting sold to be turned into fertilizer or paste to infect cows with all matter of diseases. Things that tend to make inventory worth more money: 1) Better matching algorithms. Thi…
Remnant inventory is also virtually synonymous with Google... really, how? ...which a multinational advertising company which occasionally produces industrial biproducts of advertising... what? ...which generate non-trivial amounts of value for almost every human alive. wat? Do you really believe this?
Advertising is not traditionally sold on a self-service basis. It is traditionally sold via Big Enterprise Sales processes, caricatured above as "steak dinners between advertising sales and ad buyers at big brands." This is enormously big business: ever bus ad, every TV ad, most newspaper ads, etc that you've ever seen was sold this way.
Google is the alternative model for advertising, and (as such) is overwhelmingly remnant inventory: that which we still have to sell after the Enterprise Ad Sales is over with. Google makes 97% of their revenues -- read their annual reports for how many billions of dollars that is -- through a) creation of remnant inventory (primarily on their search engine) and b) monetization of remnant inventory (2/3 on their own properties, 1/3 all over the public Internet).
Do you really believe this?
There is a little bit of exaggeration and understatement for comedic effect -- specifically, the words "biproduct" and "non-trivial." I absolutely believe, in my heart of hearts, that Google is primarily an advertising company which makes excellent use of technology, not a technology company which makes good use of advertising. That is easily the most controversial opinion about our industry that I have. I also think that Google has created more value for more people than probably any other company in history. I respect that you may think differently about either or both of these points.