Same thing happened to me yesterday. I had 12 impressions and 6 clicks, and no money. I never, ever click my own ads. I don't know what is going on.
thats because someone clicking on your ads from the same ip again and again thats why google didnt pay for you
Thats a bit stupid, even if someone with other ip makes several clicks in a short period it will be considered fraud as well. Google just doesn't have any way to tell if the person is making clicks for fun or not, they will always consider fraud in all probable cases.