There is very little seignorage in mining using GPUs -- so if a bitcoin is worth $6, $3 or more went to the electricity (using U.S. residential average rates). New technology (FPGA) are much more efficient, but then the expense is in the hardware, still causing there to be very little seignorage.
i.e., nobody is magically finding bitcoins landing on their laps (well, except those whose electric costs are subsidized by someone else).