That's called rationality. The paradox is thinking it's worthwhile to squander the few free hours you have to make a number go up. OP made $15K selling snake o

That's called rationality. The paradox is thinking it's worthwhile to squander the few free hours you have to make a number go up. OP made $15K selling snake oil of a specific nature that, if it were a legitimate product, would have made far more than $15K if he simply used his tool himself instead of productizing it and selling it to rubes and crooks.