If you walk 10k on avg a day from 30 to 70, you’d have to live until 130 to break even. It only gets worse if we consider steps walked since birth.

That’s before you consider that I’d rather have money while I can walk. Even looking purely at it from a most money at the end perspective I could invest the excess 1.5k a day and make far far more than you could breathing. I could also quite likely beat 10k steps on most days, when I go to a festival or other walking activity (which I would do a lot more with all the free time I’d have) I pretty often break 25k steps.

So the expected value is much higher for walking is way higher even factoring in the chance of a horrific accident.

Of course maybe you’d rather not feel obligated to walk every day, or maybe you’d rather play it safe with breathing. Those are both valid choices, 1k/day is still more money than anyone needs. But walking definitely makes you more money by the end, and personally I’d appreciate the incentive to stay active.