Pay Per Impression or CPM are advertising programs web publishers use which generates money every time an ad is viewed. The payout is usually per 1000 impressions of an advertisement. For example, if you own a website that has 500,000 hits a day and you are earning $5 per 1k impressions, your payout would be $2,500. Monetizing with CPM is ideal for content rich websites with lots of traffic but little in terms of related products or calls to action. The following are reviewed Pay Per Impression networks and other resources offering assistance to make money with CPM advertising programs.
My site contains 50,000-60,000 traffic per month in which 70 to 75% traffics comes up from organic search.
Microsoft pays per impression, not per click. An impression means the display of a single ad. Payment comparisons between ad-units and ad-networks is doing using eCPM "effective Cost Per Mille", meaning the amount paid for 1000 impressions. Despite not being paid per click, clicks matter because they can affect the amount an advertiser is willing to bid on your ad-space - more clicks can result in higher eCPM. Good luck!