I don't like applying for staff positions because it feels like I'm trying to get power. But the responsibilities listed in Crash's original post make it sound like it would be more about helping people, and I like to help people. I used to be a bit reluctant to get too much in to this community because I had heard that it could be a bit cruel. But I realise that if I am serious about investing time in level design, beginning with TF2, then this is probably the best place for me.
I am concerned about the future of this organisation given the age of the game it's based on. I'd like to know that it's ready to adapt and change to stay relevant and useful, and being inside the organisation is a good way to help ensure that happens.
If I don't like something I will press for its improvement.
At the moment though it seems you have more than enough people to help you. I am wary of overfilling the ranks.
EDIT: I'm also a nice person. I make a point of welcoming people in the chat room, asking how people are, and taking an interest in their lives. I dislike being ignored so I don't want anyone else to feel like they are.