I read a lot of people talk about how big a home advantage is in tournaments such as the Euro Cup or World Cup. Really, why is this such a big advantage? I understand it giving a small edge, but at least in the World Cup, it seems to almost determine the winner. I know that the home morale and crowd support is nice, but I figure that can only get a team so far. Surely the other teams have players that are more professional than to play sub-par when not at home, or not on their home continent, right? Or are pros just that lazy? Do corrupt/biased referees often play a factor? (they seemed to in Euro 2004, or so I heard) What factors really make this difference? Not just for the home team... but I also read how non-Euro teams have a disadvantage going to a World Cup in Europe... what factors contribute to this? Pardon my ignorance... I'm a newbie, in the learning process.