Chill out ! I never said it doesn't work for ANYONE. We actually got introduced to MoPub by Daniel from Mag Interactive (the folks behind Ruzzle) and they were very happy about it. They have millions of users and as you said, they can negotiate better terms with some advertisers and make some revenue.

For us (and we're not that small...> 400.000 downloads) it's not significant. And we are more popular than the majority of apps on the App Store.

Have you developed a mobile app that makes a lot of revenue ?