It's quite accurate, you've got to admit sending billions of impulses at about 0.5 volts isn't going to cost much it might sound big but each impulse is almost 1/1000 of a second so it does'nt consume much energy.
ok if each impulse is .5 volts and they last 1/1000th of a second thats 500 volts a second
times that by billions and you get a lot of used energy
but that's just me playing along with your argument so ueah