Lily JamaliNorth America Technology Correspondent, San FranciscoGetty ImagesAhead of Tesla's annual general meeting (AGM) on Thursday there's been one key message the electric car-maker has been hammering home to shareholders: the boss is worth $1tn.It has taken out digital ads to make the case for Elon Musk's proposed bumper pay package, while Votetesla.com features a video of board chair Robyn Denholm and director Kathleen Wilson-Thompson praising him, as triumphant music crescendos in the background.It's not clear that everyone is singing from the same hymn sheet though, meaning the AGM...