The $10 billion in that scenario isn't worth any more than ~$3 is today, so it's not actually as lucrative as it sounds. :) Plus because there's hyperinflation happening, the $10 billion you sold your bread for may not be enough to even buy a cup of flour tomorrow, so it's actually worse than owning a bread factory now. It would be better to keep the bread, which will be worth $25 billion tomorrow, except that bread goes bad eventually. So instead of holding bread, you hold assets that don't lose value over time. You don't want to get caught holding this hyperinflating cash because it devalues so quickly. So either you trade your assets directly for other things that you need, or use a different currency that isn't going crazy.
Yup it certainly could be, although it loses value in the form of maintenance costs and can only earn value in the form of bread. So if you can find good bread-trading partners or can sell your bread for non-devaluing currency then that can work out.
