[vpFREE] Questions on Charting

From time to time, I see people charting video poker machines. Usually , they secretly mark a notepad when they get a good hand, or a near miss on straights or higher. Considering this activity does generate heat from management ( they dont like people playing VP with pen and pencil in hand ) I'd like somebody to speak up on why this is still a worthwhile activity. Possible benefits are:
a. check if machine is random
b. try to find a machine A hotter than machine B
c. try to determine if machine A generates more slot points than machine B
d. try to justify's one's total EV ( ie. I'm 10% down for the year because I did not get my fair share of ducks )

what am I missing by not charting ?

thanks in advance....Tom

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