The part you're missing is that those people also believe "first world" countries are at risk of having the same things happen: hyperinflation, debt crises, confiscation of wealth/assets.

And if the risk of those things goes up, a rational person increases their bets as a hedge. Because the payday does go up, but only because everything around it is collapsing.

The difference is that you don't think those things could ever happen here; in our peaceful, stable, bourgeois society.