I seem to recall that in many cases ( such as say a stand-alone tuner ) there was a nearly insignificant draw when "off." This often was caused by the chassis bonding capacitors so the switch is marked "standby" to meet guidlines and international regulations.
If the unit is remotely controlled, there will always be standby power, operating the circuitry required to remotely respond and turn on.
Literally unpluging all your gear each night will result in the joy of reprogramming everything each time you reapply power also. I would rather pay the basically insignificant power bill for standby mode.