It's probably already been said (can't be bothered to read). But if you're looking to get highest DPS then you're playing wrong. You should be playing as a team, trying to complete the objectives of the game and then, and then only should you be happy if you managed to get highest DPS through those.

If I go madness and just run around the whole game throwing DoTs etc, I could probably near 800k damage. Though, doing so is very, very boring.