If you figure 4 games every half hour while multi tabling, that would be 8 an hour with an ExW:L of 4.8:3.2
If you're playing 10+1 games, you're making $8 an hour (43.2-35.2) if you can keep to that 60% ratio and manage 8 games in an hour.
It's rough going, and not really worth the time imo.
I usually play 2 real tournaments and 2 DoNs while I play because I know I don't have to spend as much time with the DoNs.