Recipes was the first thing that came to mind when reading the question. You summed it up really good.
I'd like to add that the money isn't made from the recipe itself. It's made in the restaurant, by having a service, other features, ingredients, etc... Same with open source. Vim doesn't make you any money, but what you produce with Vim might.
Ha! Haven't thought about it this way. You're right that this analogy goes even deeper than I imagined :)
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