Will kill for food. XD
Actually, If I wanted to kill someone for gold, now that I think on it, probably Lucius for looking like a girl. $20,000 gold would have me set for the rest of the quest. ^^
Naw, I rarely use arenas now. Last time I did I lost a character, so you could say that that was a turning point for me. Even if I started a new quest again, I wouldn't abuse, there is no need for it.