This brings up the interesting question of the general (non)value of a lot of mobile advertising. High impressions, super-low click rates, with many "falsies" because of tricks by the developer, eg where the advert is shown at random, quickly covering up parts of the user interface or extremely close to legitimate user interface elements.
Case in point, the app "Reddit in Pictures" bounces its adverts up and down at the bottom of the screen. If the advert were static, you wouldn't make the mistake of clicking on them, however, due to the bounce it has happened to me at least 20 times in the past month.
In short: for me the only valuable advert is a google advert... visible at the time when people have actually expressed interest in a topic/product, because they search for it. Note: google display network advertising is equally useless/fraudulent.