I haven't done the math it'd take to really say "I made $x more or less load-balancing."  Just eyeballing it, they're all in the same ballpark, all have fairly frequent technical problems, are all unpredictable over short periods of time.  And, oddly, do NOT necessarily move in lockstep... presumably because of the highly variable lag between receiving a cgminer share and converting it to confirmed Bitcoins.

I just got tired of trying to figure out who was best and figured "Together they'll all average X BTC/Mh/day, keep all my miners busy all the time, and besides I have other shit to do."