The personality type capable of exiting the economy by forty is, almost by definition, incapable of sitting quietly on a porch once they get there. In other words, the thing they think they're buying with all that sacrifice isn't freedom at all, but membership in an ascetic religion that simply doesn't call itself one.
The archetype is familiar to anyone who's spent time in FIRE forums: the six-figure earner tracking the depreciation of his socks, splitting a cramped apartment with roommates well into his thirties, declining a drink with dinner because it doesn't fit the model, all in service of a seventy percent savings rate and a retirement date circled a decade or two out. He hates the job. He hates the apartment. And he is banking his prime years, one declined cocktail at a time, against a hypothetical future self he's fairly confident will eventually be allowed to enjoy them.
He thinks he's buying his freedom, but he's actually building a cheaper cage, and furnishing it himself, line by line, in a spreadsheet.
The FIRE movement ("Financial Independence, Retire Early") pitches itself as the ultimate hack against corporate drudgery: slash your expenses, invest the difference, and buy back decades of your life ahead of schedule, as though time were just another asset you could accumulate through sufficiently aggressive saving. What the pitch conveniently skips over is a fairly obvious psychological problem, which is that the exact personality required to hoard capital and optimize tax accounts with monastic discipline for fifteen straight years is not a personality that can simply flip a switch on the far side of that discipline and learn to do nothing.
If you have the neurotic focus to track every coffee purchase through your entire twenties, you are not, by the time your forties arrive, going to be the kind of person who can sit on a beach and let the money burn. You will have spent two decades training your brain to treat spending as a small moral failure, a leak to be plugged rather than a use of money to be enjoyed, and that kind of training doesn't politely reverse itself just because a number on a screen finally crossed a threshold you picked when you were twenty-six.
The reward for extreme frugality, in other words, isn't freedom.
It's a lifelong inability to enjoy whatever you managed to build.
This same obsession with the floor instead of the ceiling shows up everywhere the frugality mindset takes hold, well beyond personal finance: you'll watch founders burn entire weeks negotiating a fifty-dollar software subscription down to forty, with the same intensity they refuse to spend chasing an extra point of revenue growth, because there's something about defending a floor that feels safer, more controllable, than the messier work of building a ceiling.
And that instinct is backwards, because there's a hard mathematical limit on how far frugality can take you—you can only cut a baseline down to the bone before there's nothing left to cut—while there is no comparable ceiling on what you can earn. Growing your income scales in a way that starving your lifestyle to zero never will.
Yet people obsess over the floor anyway, not because it's the better lever, but because optimizing scarcity feels safe in a way that pursuing abundance, with all the risk and uncertainty that requires, simply does not.
Trading the healthiest, most physically capable decades of your life for a spreadsheet projection of a future you may not even want by the time you get there is a genuinely terrible bargain.
Especially given that money is only useful when spent.