No, but they paid for the computer - which seems like exactly the same situation. Physical items that have per item costs? Pay what the item costs. Digital i

No, but they paid for the computer - which seems like exactly the same situation. Physical items that have per item costs? Pay what the item costs. Digital items that have no per item costs? Pay what the item costs (nothing). Your time? If you want to be paid, start a commercial venture (aka - a company that charges). If you're doing it because you like it? Charge what you'd like - in my case nothing.