I agree with basically everything said here, I don't think that any judge consciously puts a team ahead because of the emotion of the crowd, but I think it may have an impact, especially when the homecrowd is especially vocal. Again, I don't think it is going to have be the difference between 4th place and 1st place, but (under the old system) it might be the difference between 5.5 and 5.6 or 5.7
I do agree that the homecrowd can certainly motivate a skater, but there is also the factor of being nervous skating in front of so many families and friends.