if you accrue ff miles via actual flying, those miles are not free

you have implicitly paid for them as the costs of the frequent flyer programs - including IT programmimg, additional hardware , advertising, personnell costs - are all included in the price of your ticket

so not to use them is a waste of your money, and you essentially subsidize those flyer who do use them

i'm waiting for an airline to come up with multi tier priicing and produce a fare that doesnt inclide miles and is always10 to 15% lower than a mileage accruing fare

one could argue that those programs whose points expire in a year are at least tending towrds this, but they are notq uite there yet