Marble reacts with almost anything, gold and nickel is the last thing to react. Elementary school chemistry: Gold is the least reactive metal
Yet another case of elementry school chemistry over-simplifying and getting things wrong. Silver and platinum compete with gold, even if you stay within the realm of elementary school definitions of metal.
My guess would also be that most people who had school chemistry would order the silver, gold and platinum correctly in terms of their relative reactivity (and value) because this replicates exactly the order of fanciness of credit cards, record sales etc.
But - try to handle some fine gold one day. It is lustrous, but also incredibly easy to dent - drop it and it’ll scratch like a 2010s-era phone. It is easy to work, but won’t hold its shape. If we had oceans of the stuff, we still wouldn’t use it to make a car or a laptop or a pistol or a building, it would take the place of lead in things like counterweights and radiation shielding, maybe home insulation or cooking foil, places where its softness and density aren't too much of a drawback but the low reactivity is beneficial.
For some particular values of "best".
As gold is rather malleable (soft), these plates would probably scratch easily.