You need to assume that water in my example is not a limited resource, as I don't feel adservers are.
What's the feedback on Google Ad Manager? Have you guys been able to use it for billing?
What do you mean by billing?
You can sell and tracks your spots but the billing is done outside.
i think adword advertisers will be able to bid for your spots very soon, let say you make 20$ a CPM with a banner spot and you accept adsense if it pays more; it will become a cheater's heaven.
He means getting an ad network to accept Google's impression numbers to bill off of if you're using it as an adserver.