"Finally, although you gain the improved/lower electrical...

"Finally, although you gain the improved/lower electrical resistance, you only gain that benefit for the proportion of the anode that contains the graphite, meaning the net result in operating costs is tiny, and not worth the increased cost of raw materials."
Wrong. Thats not ow eeliktrisity workz. Whoever wrote the above hasn't got a clue how resistance is calculated for composites. The primary driver for substituting a part of the coke with graphite is performance and not shortage of quality coke. With a limited supply of graphite only the industries that need it most, i.e. not aluminium, used it. Soon there will be enough graphite for everyone.