Well, depends on how many hours in the day you have free for gaming. Like you, I have pretty much 5 of every class so near 50 toons except for the odd triple priest & triple warlock groups. Dont know about you but I get pretty tired of doing the same dailies for hours on ends. I usually do just the easy dailies in icecrown now. Pre argent tournament, I was knocking out just the 8 from the airship (minus that's abominable, because it's buggy as hell) + 5 ebon hold + 1 pvp daily (the mountain hopping in robot one). At my best and with luck for ground spawn and drops (like for drag and drop), I was cranking out these 14 dailies in about 40 - 45 minutes. This is with epic fliers for all teams, to cut down on traveling time. This comes out to about 1k gold per team. If I was short on cash I can also knock out the 4 venture bay pvp dailies for another quick 200g per team.

Now with argent tournament, I'm farming those dailies (minus the jousting ones. collecting 3 marks per toon makes my head hurt.) and cutting out some of the other dailies to keep it close to 1 hour per team. Because I dont know about you, but I usually get burned out by team 4 or team 5 doing the same dailies over and over. It's not fun anymore. It feels like a second job.

But hey, if you have the patience for it, I would say that you can easily make 1k per hour, per team, if you just do those icecrown dailies that I mentioned. And if you can stomach spending 10 hours plus to knock it out on all your teams, my hats off to you; god knows I cant do it.