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Advertising is all about CONTEXT and AUDIENCE. You have omitted that crucial information from your question.
The "best case" scenario would probably be about $20,000 per month ($10 eCPM) -- far fewer than 10% of advertising-supported web sites earn that much (measured by eCPM). Probably fewer than 1% of all advertising-supported web sites earn an average eCPM of $25 or more -- at $25 eCPM, such a site could earn $50,000 per month from 2 million pageviews.
But many sites with 2 million pageviews per month are struggling to earn even $200 per month ($0.10 eCPM).
I won't bother to identify an "average" because your site isn't average -- it is whatever it is.
The stats suggest that this may be a forum or discussion site; such sites usually fall at the low end of the spectrum for advertising income, because visitors come to the site for a specific purpose and their eyes focus on the messages, not on ads.
In addition, revenue is likely to be quite different depending on the pageview "distribution" at your site -- it's unlikely that you have 133,000 unique visitors each viewing 12 pages per month -- instead, you probably have far more than 100,000 visitors per month viewing only a few pageviews each, but several thousand visitors who each view 200 to 1,000 pageviews per month.
Added: If you're not familiar with advertising terminology, the term "CPM" refers to "cost per thousand" (M is the roman numeral for 1,000). While "M" usually refers to 1,000 pageviews, many advertisers won't pay for multiple pageviews by the same visitor. Most advertising is not actually sold based on "CPM" and therefore most publishers combine revenue from all advertising (CPM, pay-per-click, pay-per-lead, affiliate) and compute an "effective CPM" or eCPM for the site overall.
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- Thanks Mark. I appreciate your effort.