[eru]

Training amortises over countless inferences.

And inference isn't all that expensive, because the cost of the graphics card also amortises over countless inferences.

Human labour is really expensive.

See https://help.openai.com/en/articles/7127956-how-much-does-gp... and compare with how much it would cost to pay a human. We can likely assume that the prices OpenAI gives will at least cover their marginal cost.