The model of having regular sales to capture people who wouldn't otherwise buy, on a product that is digital so costs nothing to create (ie all costs are alread

The model of having regular sales to capture people who wouldn't otherwise buy, on a product that is digital so costs nothing to create (ie all costs are already sunk), is done really successfully with video games by Steam. People actually complain when there's a good Steam sale because they end up spending so much money, $5 or $10 at a time.