If you've been raised to be a saver, you are well trained at living cheaper/less frivolously. Note that this presupposes that you make enough money to live reasonably and save; I'm not talking about the extreme poverty cases where immediately spending the rare windfall actually makes sense.
By cheaper, I mean one car instead of two, simpler vacations, less eating out, less fancy house, "using up" quality consumer goods instead of constantly replacing them with the latest fashionable stuff (e.g. second complete kitchen makeover in 15 years).
Suppose person A makes X and spends X and saves nothing. Person B makes the same, but spends 0.5X and saves 0.5X. Now suppose an economic disaster where all those savings are wiped out and A and B additionally end up taking a 50% pay cut. Who will continue to live in comfort, albeit with misgivings about not being able to save up again?