All I can really add to the current discussion is to point out that the manga, which in several places has served to visually clarify ambiguous elements, consistently presents the gold as a big-ass mountain pile. You can get a pretty decent view of it in End, in particular, and it's definitely taller than everyone's heights, even accounting for the palette. At any rate, way way larger than the pile shown in the anime.
I'm not very knowledgeable about this sort of thing, so I assume it was, uh, artistic license, for the sake of making the amount seem impossibly grand? Also, aren't there several definitions regarding the word "ton"? Maybe there was confusion..?
