Thanks for the post. In football (11 players on a team) the crowd is called the "twelfth man." The team hires cheer leaders to make sure that the 12th man does its part along with the other 11 to achieve victory.
It makes sense. If you are an official making a call and fifty thousand fans are shouting at you telling you you're wrong, it might make you think twice about what you thought you saw. Plus, in a championship game the officials are generally more hesitant about putting themselves out there as the guy who snatched defeat from the jaws of someone's victory.
In skating, performers that can make the audience stand up and cheer do have an advantage, whether in their home country or not. At Boston, the audience was enthusiastic about quite a number of performances, for instance Sakamoto's gem. Give the audience something to get excited about -- it can't hurt.