The cost-based pricing is inherently flawed as supply/demand typically governs prices, however digital media tends to stick to whatever tradition dictates, e.g. $60 for a game or $0.99 per song. It is hard to gauge sunk costs for performance art past what it costs to run the studio for X amount of time + whatever salary artists get paid.
That's true. I find myself coming down on the side of "the creator should set the price" rather than the consumer. Digital media is weird in that it's very easy to duplicate the creators work, but as the "supply" is potentially infinite, I'd like the system to be a price/demand ratio, where the cost of the item determines whether the product is consumed, instead of the consumer circumventing the creator to consume the product without remuneration.
If humanity could invent a magical machine that makes a direct atom-for-atom replica of any physical good at zero cost, using zero raw materials, I would expect the market price of those physical goods to drop to zero or near-zero. This is an economic rationalization, not a moral one.