That's all well and good, but at the end of the day, it will be an article that was conceived with the intention to sell something. Fortunately, most people can see through this. I know I can tell when I'm being sold something no matter how insightful it attempts to be. It's the lack of integrity that robs it of its value.
"Ads disguised as content can be used to describe all forms of content marketing, am I right? ;)"
Essentially, and it sucks.
It does not work this way since Google started to rely on behavioral metrics of content, not just keywords. Useful articles that people read and refer to frequently, go up, junk goes down. So creating articles with only aim to sell something is the sure fire way to anger people and waste your money. Content marketing nowadays is about producing quality content IN HOPE that it will help to sell your product.