Child of a Metal God

I'm assuming the outlets aren't meant for public use, and are probably for janitors plugging in vacuums and/or floor polishers and the like. The ones I've found in airports certainly aren't placed anywhere near chairs, or other places where they'd be comfortable to use with laptops. As to why they don't offer more of them, it's probably because they don't want to rewire entire buildings in order to provide free electricity to people hanging out in airports. It isn't just the cost of the electricity, it's the cost of all the work that would have to be done to make it possible.