Wall warts, lifespan and power consumption

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I've just fitted a network switch at the back of the AV stand in the family room, so the TV, BDP and AVR will all be permanently connected to the switch and for lightning storms etc. I only have to disconnect the Ethernet cable linking the switch to the rest of the network.  The switch comes with a 12V 1A wall wart which I'd like to plug in and forget about. On the 12V DC run from the wallwart to the switch is a power button that allows me to turn the switch off when not in use. Of course, the wall wart on the other hand is permanently on, which bugs me from a lifespan and wasted power perspective.

So, my question is this - when you've got wallwarts plugged in and the plug socket switched on, but the wallwart isn't coupled to the device it's supposed to power, is it constantly drawing power, and is there likely to be any noticeable impact on lifespan? Would it be best to add a multi-plug adapter with the ability to power individual sockets to the mix? I know one wall wart is immaterial, but if you look around the place there are a multitude of wall wart chargers plugged in around the house to serve mobiles, tools, switches etc.

 
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