If the world turns into a mad max apocalypse, we're all fucked anyway so why care where your money is? 50K is barely anything, just leave it in a bank account. (or buy a cabin far away from everyone, if you really think society is going to collapse)
I doubt it'll be a fullblown apocalypse, but I think there'll be a period of unrest, after which civilization will soon reestablish itself. If you manage to invest 50K of your money in something tangible that is considered to be of value in that period of unrest, you'll have a much easier time surviving it.
For us, 50K is enough to survive for at least three years, without requiring any kind of austerity. I certainly don't call that 'nothing.
