Just a thought: if they gave dps the xp bonus for running roulettes that would make dps level up faster, making people finish their dps jobs faster, giving them time to maybe queue as healers or tanks.
I'm planning to level a healer up once my current dps is done. But it takes forever to get the necessary xp. Then, when I'm at my healer/tank it'll take half the time cause of the constant bonus.
So I thought, if I got that xp boost on dps instead, this would be 70 in no time, making it possible for me to use healer/tank or whatever is in need more, which I don't do atm, cause I need the xp for my dps class.