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Google To Allow Double Serving Ads.
(www.seroundtable.com)
This is a most excellent place for technology news and articles.
I know how it works but thanks. Impressions are cpm vs cpc like you described. The incentive is to have the cleanest traffic in order to get bigger budgets from agencies. Yes, there are shady networks that will look the other way but the original comment stated everyone in the space is bot friendly.
Edit: I could have worded that better. Eh