Revenue Sharing question

How do revenue sharing sites like mypayingads and triplethr3at make money? I can understand CPM for mypayingads but for the other one all I see is we are clicking business' ads. Is it a program they join or do they just tell the business to promote on their website?

from Pay Per Click Advertising http://ift.tt/1SIEmMj
via IFTTT
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