I did also think about that too for a few seconds, the whole WB being the distributor of both CW and TDK.

Considering Clone Wars was not initially supposed to be a feature film any money WB and Lucasfilm make off it is a bonus. If Lucasfilm wants to complain that CW didn't get a big marketing push in favor of The Dark Knight (which we've seen no evidence of yet, the complaining that is) well all things considered from what has been written in the past I think they were lucky any major studio picked up their tv show at all.