Great question riverrick! and not stupid at all!
I never leave any of my equipment plugged in when it is not being used.
there is alway's a danger from power surges and lightning in a thunder storm or if the power to your home just suddenly gets cut off for any reason.then when the power is restored to your home there is alway's that danger of sudden power surges that can ruin any of your equipment.just being on the safe side