Gates either decided to take his juvenile frustration out on the whitey that arrived, or he decided to create a scene to deliberately prompt an arrest to provide material for his next propaganda project.
But, EVERYTHING that happened happened as a result of Gates' deliberate choice of actions, and nothing would have happened if Gates had been emotionally older than a ten year old spoiled brat.
Let's make sure we know where the blame belongs.
Since the police did nothing wrong, they haven't opened anyone to a civil lawsuit for any reason.
The Department or Officer Crowley should countersue charging Gates with stupidity and racism, both of which should be civil offences.
But you did open a third possibility, that Gates deliberately provoked this incident to play the lawsuit lottery.
There's also the book he'll writing about this.
So your suggestion that Gates did it for purely monetary purposes is valid.