I've got a BT BB hub, and I leave it on all the time for the simple reason that if SWMBO wakes up in the night and wants to use her ipad, then she can, and I sleep on in blissful ignorance.
If I had to, I would train her in how to turn on things computery, but I don't have to, so I don't.
The rest of the leccy stuff gets turned off as we've got one of those digital leccy usage monitor thingies.