because also in the dom, it doesnt highlight the levels that you are passed or your entry price on the dom which is really annoying to figure out how far away the bid/ask have moved away from your entry.
Just got the newest trader monthly, has an article about a guy who walks on a treadmill while he trades, because his "heart rate is already preoccupied"... sounds fun.
i dont know these hedge fund types dont just a scalp a few dollars here and there, especially with a small timmay fund to make your thing look a few fraction of a percentage positive each month, as long as you are still collecting your fee