Very good point....and pretty much what I was trying to convey.There are huge numbers of 'free electrons' in conductors but they are not spare in the sense that it takes 'work' to separate or move them in a non-random fashion like current in a wire or as ions. That 'work' could be from the sun or the initial formation of the solar system so it's very possible that a planet or moon sized object locally would have a net charge but there is actually no way to define the net charge of the (closed or spatially infinite) universe so effectively the net charge is zero.
"To weigh something one needs a platform on which to stand to do the weighing."