Just your niches in general. If you choose keywords that have higher CPC You're going to get paid more. I wouldn't choose any niches that didn't have at least a $1 CPC. For example, VOIP is a good one.
It used youtube... ?weird? is that all invalid click?
the earnings are 0.
Hi Kamil,
I too face the same issue. I was about to start a new thread, but saw your thread. I am not worried about CPC, but my Estimated Earning shows zero.. Yesterday's statistics given below, count I have changed a little, it is not exactly same but very similar.
Page views - 2,200
Clicks - 51
Page CTR - 2.30%
CPC - $0.07
Page RPM - $1.64
Estimated earnings - $0.00
Not sure what happened in last few days.
One promising this I can tell from my experience. Youtube have some bugs, they are fixing it. Eg:- 1 - one day when I checked, Monetization option was removed from my account and later understood it is a bug and later it was fixed and monetization tab came. 2 - some days back I were unable to associate old adsense account with new channel, later understood that was also a bug and they fixed it after two days.
So we can hope this is also some kind of bug and lets see if it is getting fixed automatically. (Though Adsence and Youtube are different they might be experience some difficulties).
Lets hope for the best.

If you wanna incenses your CPC, you have to make good content with highly pay keyword. adsense pay on good quilaty content words.
Thanks all. One more question. Now adsense dont show up earnings anymore, but we get checks and all through adsense, so will all youtube channel's money will be coming to adsense combined and then to us. Any idea? I am confused.
What i heard that is going to happen is that at the end of the month the earnings on youtube will jump to your adsense account and will be put as balance for the month.
You can actually check updated youtube earnings on adsense instead of waiting for them to update on youtube analytics. Go to your front page on adsense, click view full report and then hosted adsense for content and that should be your youtube earnings. Hope this helps ^^
Thanks kamil, that is actually promising information.
I almost hijacked your thread for clearing my doubts and questions, it was a very similar thread, that why included in this thread, sorry for that.
Regards