You score by removing your own warriors from the Senate, with 2 courts you would be able to remove 3 of your warriors from the senate per turn, effectively scoring 6 points. Admittedly, i didn't phrase it well enough because I was running out of space - the owner of the envoy scores one, THEN, you score 1, so you score 2 VP total when removing your own envoy.
With relation to WA and similar factions, it's pretty much the same trade off as Otters have with their trades.