The problem with "costs less than developer's time" math is that, usually, it's not you who's paying. Your users are, often in nonobvious ways, such as through higher electricity bills, reduced lifespan[0], lost opportunities, increased frustration, and more frequent hardware upgrades.

(And most of your users don't have developer's salary, or developer's quality of life, so it hurts them that many times more.)

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[0] - Yes, wasting someone's time reduces QALY.