iAds has its issues. But this blog post isn't the reason not to use or rely on them. Just because this guy who has a very unpopular app hasn't made much on iAds doesn't extrapolate out to iAds or ads in general not being useful for mobile.
15,382 downloads for a free app is a low download number. An unpopular app is simply not going to make you money no matter what monetization you try.
Imagine a blog post saying "Making money with Adsense? Not so easy" and then someone proceeds to detail how his site which gets 5 hits a day isn't making much, so he concludes that there's no money in websites using ads. And I suspect if this app had started as a paid app, he would have also made a piddling amount and would have written a comparable blog post about how you can't make money selling apps.
That said, iAds aren't doing well. Apple seems to be having trouble filling them. I think mobile ads are down across the board, so you do need to use multiple networks as people have mentioned.
Ads on mobile is going to be a marginal business compared to the web. Screen real estate is at an absolute premium, alternative revenue models exist (such as charging your users directly), and there's a high barrier to any call to action (such as signing up to your service on a mobile keyboard).
I doubt that any ad network will gain the traction to dominate the space.
I think it comes back to active daily use. The author mentions revenue spikes coinciding with installs, so I think its reasonable to conclude that users used the app after they installed and did not return again.
You should generally speaking use something like AdWhirl, (which will also show iAd's when they're available), because it will show other adds when your iAds don't fill.
15,382 downloads for a free app is a low download number. An unpopular app is simply not going to make you money no matter what monetization you try.
Imagine a blog post saying "Making money with Adsense? Not so easy" and then someone proceeds to detail how his site which gets 5 hits a day isn't making much, so he concludes that there's no money in websites using ads. And I suspect if this app had started as a paid app, he would have also made a piddling amount and would have written a comparable blog post about how you can't make money selling apps.
That said, iAds aren't doing well. Apple seems to be having trouble filling them. I think mobile ads are down across the board, so you do need to use multiple networks as people have mentioned.