There are two things that I seem to remember from hosting:

1) Longer orders consider more possibilities which means that in general the person who sends the longer orders will win the round. Though it's important to note that it's not actually the length of the order which is the determining factor, but rather the thought that has gone into the order. A clever but short order will beat an irrelevant essay, but it usually happens that those that give more thought to their orders will also end up writing more.

2) As a host, subconsciously, you feel more inclined to favour those who put effort into your game. Those who send two line orders seem to be taking the piss a bit and as a result will not be favoured by the host, however impartial they try to be.