I'm surprised more people don't multi-table harder. I'm only playing tiny stakes now tho, so it's easier to not think and just go go go! Standard for me is 12-16. If I have 9 going it feels SOOOO slow. I'd honestly do more, but I only have a single 17" monitor, so 16 is the most I can tile before I have to have giant tables that I can't access without them popping up, and things get crazy then.
I do much better with my winrate *
hands played per hour 16 tabling than 4 myself. It's not even close for the hourly.
4 tabling = 200ish hands/hour * 21.5bb/100 = $8.60/hour
16tabling = 800 hands/hour * 7.98bb/100 = $12.77/hour