Setting a fixed price for something that is not intrinsically related to costs (like an optional contribution if someone likes what you're making) is illogical. Different people will attribute different amounts of value to the same piece of content, due to their own priorities and varying levels of wealth.
A busker doesn't say "$5 bill donations only" and neither should you.
A price is also not justified by the costs. Price discovery is always subject to how market participants value a good or service based on need and availability.
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