Players like points. Some players are even addicted to points. Yesterday I saw a post in one game forum. There the player told how his opponent was losing the game, but just before defeat the other player left the game: In this situation the game system gives both “win” and “lose” ranks to both players. So, basically this player was pissed off. He went to game’s official forums and told about the situation and even posted a replay file. He then posted to game admins and wanted to get that “lose” rank away. It was important because he had won over 30 games and lost only one.
Doesn’t this prove that players just love to get points. They want those victory points. They want bonuses. They want more and more points. When designing your game: keep in mind that Players Prefer Points.