Middle Manager Man would hardly switch off the device, let alone know where it is.
Many of us despised pax behind the flight deck door are actually in the IT industry and know perfectly well how to switch the wireless on/off, and what the little blue light on the front of the laptop means.
Free wireless in the frequent flyer lounge usually fades once you leave the area
The signal does tend to leak for a short distance outside, which is why you can find non-lounge entitled laptop-using passengers squatting alongside the lounge entrance taking advantage of a nice free service.