The tyranny of the marginal user reminds me of population ethics' The Repugnant Conclusion.[0] This is the conclusion of utilitarianism, where if you have N people each with 10 happiness, well then, it would be better to have 10 N people with 1.1 happiness, or 100 N people with 0.111 happiness, until you have infinite people with barely any happiness. Substitute profit for happiness, and you get the tyranny of the ma…
That conclusion is not repugnant at all, it's just that its phrasing is so simplistic as to be nearly a straw-man. It's a poisoned intuition pump, because it makes you imagine a situation that doesn't follow at all from utilitarianism. First of all, you're imagining dividing happiness among more people, but imagining them all with the same amount of suffering. You're picturing a drudging life where people work all da…
If you have a sure-fire way to get half the people on the planet to give you $1, you can afford a yacht. Even if it means the tool you make for them only induces them to ever give you that $1 and not more... Why do you care? You have a yacht now. You can contemplate whether you should have made them something more useful from the relative safety and comfort of your yacht.