[mfkp]

I'll have to plug in a power meter to check, but I'd assume the ghost power draw is negligible.

[high_priest]

It ends beings negligible, when you start to have 10 devices sipping 0.5-1W each.

[mfkp]

Doing some quick math in my head, even at 1w draw each, if they're constantly drawing that 24/7, it would end up costing about 80 cents per month (at $0.11/kWh). The cost of purchasing the chargers easily outweighs that. But I probably only have 5 around the house, so I have no problem spending 40 cents per month.