danimal, yes that's the setup for video ads. kind of "pay per click while viewing". i was (falsely) assuming, that the mentioned "adsense video" follows the same payout rules.
if this is the case, then that's indeed a whole other story. because even more than image ads, you simply can't pay video ads per click to be worthwhile for the publisher. you have to be compensated for the high visual branding impact and the user involvement in the advertising medium and distraction from your other content.