I believe that multitablers' win rates go WAY down by multitabling, and I am including those who 4 table in this, not just 8 or 10 tablers.

At the lowest stakes limit holdem, .50/1 or 1/2 tables, players pop in and out of the table every 5 minutes. There is no way you are managing to get decent reads on these people 4 tabling when someone enters and leaves one of your tables almost once per minute.

In addition, multitablers usually play full ring instead of 6max, because they can't handle so many tables of 6max. This definitely hurts their win rate.

I believe that 4 tabling full ring tables at .50/1.00 or 1/2 will make you perhaps the same amount that you could be making playing 2 tables (or less) at the same stakes, 6max.

(I have read that at sitngo's, reads on ones opponents are not important, so perhaps this doesn't apply there)