Quote from Chris Watts:
I work at a prop firm, and sometimes think that some traders simply have way too many monitors. For example, there's a row of korean guys who sit near my group. Each of them has 7-8 monitors each. Perhaps if they made thousands of dollars on a daily basis it would be justified, but I'm finding out half of them are pikers and the other half avg a couple hundred a day. Do some of you feel having more monitors actually helps your trading? or do most of you have them for purely "show off" purposes.
I personally have 4 (99% of the time, i'm just watching 2) and have absolutely no need for any additional ones.

Quote from CalTrader:
With all due respect to all the "I need ten monitors" people .....
(1) Even in the largest arb/hedge shops I have worked for the best people did not need all of the information screens: just a few and 4 was usually the upper limit unless there was some exceptional need.
(2) Its pretty well researched and understood that people really cant work reliably with more than about 4 sources of information - greatly diminishing returns start at three - four sources.
Of course If you make big bucks and believe that you need a wall of information surrounding you to make money then go ahead and spend it: its a cheap pacifier.