Doesn't multitabling put you at a huge disadvantage?

[skierdude1000]

When I play my STTs, I pay super close attention to the players and make a lot of reads and get a lot of information from them. I've tried single tabling while reading news watching TV, listening to music, and going on AIM, and it kills like half of my game because I can't make as good plays based on players.

So my question to those of you who multitable, how are you able to play so effectively?

I doubt I'd be able to keep any ROI higher than .6 if I multitabled.