Many players understand the concepts involved in building a large chip stack during a tournament. What they don't understand, however, is how to use their chips effectively once they've gotten them. Once they've accumulated a lot of chips, many players want to control the action, but they haven't thought through how to take command of the table.
When I'm the big stack in a tournament, being the bully is always my first consideration. I want to eliminate players, continue to build my stack, and avoid dangerous situations. If I can create a scenario where I'm the table captain - meaning I dictate the size of the pots - the rest of the action becomes easier to read. I can frequently steal the blinds and antes, and if someone else re-raises, it's pretty easy to put them on a hand because I know they can only play back at me with really strong cards.