NomadMan - 8:40 pm on Apr 1, 2012 (gmt 0)
I added a selected list of 3rd party advertisers based on their location (UK, US, EU). Over more than a month it added an irrelevant amount of revenue.
It didn't drop my revenue from the Google network, compared with previous months.
On top of that I notice (by accident) that for instance McAfee gave an alert and blocked the IP's for 3rd party AppNexus in the US.
Blocked them all again.