Before I continue, I'll say I'm not a supporter of admob. I don't think ads belong on mobile phones the same way they do on the internet. But your experience i

Before I continue, I'll say I'm not a supporter of admob. I don't think ads belong on mobile phones the same way they do on the internet. But your experience is hardly revealing. 300 ad impressions is practically nothing. Standard clickthrough rates are 1% or less, and probably even less on mobile ads, so it's not a surprise that you didn't get a single click. The smallest unit when purchasing ad impressions is 1,000. If you can't make the smallest unit, you shouldn't expect to make much money either.