I have around 50 000 impressions now with a bottom banner and it has generated about 3$ so I have turned off the ads now because it isn't worth it
I respectfully disagree. When implemented correctly (Java / Eclipse), ad-revenue is a very real source of income. I offer the following screenshot to encourage people to keep trying to figure out where C2 is falling down with regards to ads.
The screenshot is from income from the last year for the 'better paying' of my apps. None are C2. The screenshot is not intended to 'brag' but to show whats possible using AdMob for revenue.
Also, my revenue is poor compared to many other Android devs and nothing to brag about.
Why not try interstitial ads? My ad revenue climbed drastically when I switched away from banners (non C2).