Atlas Shrugged spends a sizable period of time criticizing the flaws of Comte's positivism, considering it destruction of the ego and involuntary servitude for the sake of psuedo-Catholic guilt-based mysticism. The twins' thought processes echo Comte's ethics system very heavily, as do the Weasleys in general: they'd do anything for Rationalist!Harry without asking payment because they consider him worth serving without regard for themselves.

The resulting rule morality is directly in conflict with Rationalist!Harry's desire for preference utilitarianism, in addition to being rather risky on its own level.

Rand's Objectivism identifies reasons to do things without cash payment, despite the pop history version of her viewpoints. See Dagny and Galt, or for a platonic version (despite the HoYay) D'Antonio and Rearden. But that's done because you think the other person or their requires are worth the cost.