My x52 Pro, rudder pedals and TM MFDs are all plugged into a USB hub, which I only plug in (to a front USB port) when I'm simming and unplug when I'm done; this isn't an eco thing, just don't want all those lights on whilst trying to use my computer!
TrackIR is always plugged in but I only run the software when simming, so unit is off when not in use.