These things can be deceptive so you must do the maths, gut feelings mean little.
My jug is rated @ 2400 watts and if it takes 3 minutes to boil it for a pot of tea, that's 120 W. At 20c/KW that's 2.5c.
The Mac, @1W will take 5 days to "waste" 120W.
So if you get the urge for a coffee while your puter is booting, it has all been in vain. And if you put ANY value on your time it is pointless booting up the puter every time you use it [assuming that everyone here goes to it a few times a day].
