We'd like to know what is the common Revenue Split between the 3 major
entities in the In Game Advertising Industry - the Game Developer,
Game Publisher and the 3rd Party which develops the technology and
interacts with the Advertisers ( i.e. Massive, IGA, ...)
How much does an Advertiser usually pays for a campaign? Which
parameters effect the price? (Title Popularity? Metrics for measuring
campaign effectiveness? ... ).

(Appreciated is any other information about the economics of In GameAdvertising.)

The publishers usually get anywhere between 40-45% of the revenues,
and the rest of the split depends on the particular 3rd party that
handles the technology. If the technology is built in-house that cost
can be avoided and the Developers get the whole 55-60% left (which can
usually cut off about 10% of development costs). The minimum amount
for advertising is around $150,000, and scales up from there for
popularity. For example, there was a $2 million split between Nokia,
Chrysler and Motorolla to advertise in Tony Hawk's American Wasteland.

Hope this helps!

For more information you might check out this site:
http://www.doublefusion.com/in-game-advertising/in-game-advertising-explained.php