The key there is the word participate. The XP system is designed to encourage participation, especially for the newer members.
I appreciate that. But several people in this thread (and you can count me in that group as well) question what the added value of participating is, if that participating means the game has degenerated to something meaningless.
It's like asking bystanders (newcomers) to participate in a game of soccer, and rewarding them for running around and kicking the ball. Even if they don't care for the team they are assigned to, and kick the ball out of bounds. The bystanders have participated - they kick the ball, but they don't play soccer.