In terms of pure gold acquisition, I am sure that doing as many kill quest dailies as possible would be the best way to go. 50-60 gold per turn in for just killing 10 or 20 non elites is going to be way more gold, not to mention that even non-elites drop stuff sometimes. Dailies aren't like instances where you're going to end up spreading the gold you earn around. Each character you add to group is getting another free turn-in of their own when you do a daily.