Think of any survival event, war, famine, ecological disaster, socialism- anything. What do they all have in common?
They all require that we live on less than we do now. Once we realise this we can see that saving sixty percent of our income is actually survivalist training. It makes us self reliant and resourceful and teaches us that it is possible to be happy without prestige purchases.
Knowing how to live on less is more valuable than a bunker full of James Bond gadgets.