The problem isn't that people don't like to lose. The problem is that people don't like to have their time wasted. Go out looking for pvp, get zerged or dunked in 2 seconds, RIP 2 hours of your life making that gearbag and searching for pvp. With an arena (if they can manage do it right) there could be constant fights, whether you win or lose, no time wasted. The pvp in this game is FUN, people constantly sit in their cities dueling may as well let them fight other people in some sort of arena as well.