do we actually get paid if no one click on the ads? i thought we suppose to get something from Page impressions?
Yes and no. I've gotten paid several pennies before and no one clicked a thing. I think this may be the work of search engine spiders and there's a slight error and Google records it as a click. But on average and 95% percent of the time, NO YOU DON'T FROM MY EXPERIENCE, because Google is getting a percentage because of the clicks, which confirms that you've seen the content page or the advertisers website.
adsense is also paying for your imp. because of this you will earn money , if no one click on your ads. this is the perfect side of adsense
you will have to get lots of imps to get good money out of CPM ads with Google Most of the times just a small portion is CPM