You gotta remember, when you run this stuff solo in a group, you can make like 20-50g an hour. Now, he's running basically the leanest, most ideal multibox group for this sort of stuff, and he gets to keep all of it himself aka x5. I'm sure there is wild variance, but I'd guess he's making 200-300g/hr roughly, with the odd outlier run where he gets like a Krol Blade, or something else that will AH for hundreds of gold.