Quote from gms:
I don't think professionals in other fields calculate their earnings while they're working, they focus on the job they're doing instead, otherwise, they'd be distracted from concentrating on the task at hand. Imagine heart surgery being performed by a surgeon who, while his fingers are guiding instruments in the vessels of your heart and his eyes are watching and monitoring the circumstances and he's thinking about what has to be done next and what is hapenning right now and receiving multiple input from the assistants and instruments around him, he's in fact thinking, "This operation I'll get $50,000, then there's, let's see now, Mrs. Johnson is scheduled for one o'clock, that's another $90,000, gotta see if I got the insurance check from Blue Cross for the Stevens job, because that's another $60,000 I'm expecting. Let's see, that means by 3 PM today, I should book $140,000 and hopefully will get that check too."
Do you think professional poker players know how many chips are in their stack?
The question isn't whether a pro knows how much money he's got invested, whether it's in a trading account if he's a trader, medical equipment if he's a doctor, or the kitty if he's a poker player, but whether concentrating on the P&L throughout can be a pyschological hindrance or not.