Advertising is about moving product. Just a quick perusal of advertising techniques indicates that just "providing information" is a rarely used methodology. Biased information isn't very useful anyhow.
Loud noises, cute kittens, catchy songs, scary consequences, status symbols, repetition until you can't forget the company's name if you tried. That's not any information I need.
Obviously not every advert works on everyone. It'd be silly if it did. But when taken as a whole, they do work. Astoundingly well.
The movie trailers I watch in frontrow on OSX. They're advertising. I love them. They inform me of new movies that are coming out. Useful no?