@Tamerlane Notice how they used a pond of water, instead of just a glass? Or how they used a boulder instead of a pebble? I'm guessing they use a fixed volume, using the density of the material to judge the individual's magic power. Giving him just one bar would then equate to just using a boulder again.
You're using
our laws of physics to judge
their world.
We don't have magic,
they do. Ergo,
our laws of physics
don't apply in
their world. Notice how the pebble stayed the same size when turned into gold, despite gold having a higher density? Yeah, law of conservation of mass my ass.
Strictly speaking, we don't know if gold is really their currency, or even all that valuable. We can assume, since it has magic resistance and "It's not good to create gold", but not
confirm. Regardless, given that there
are low-class servants present, and they only freaked out about his power and not burning cash, I'd say "starving peasantry" is
not an issue in their territory.